diff --git a/core/lib/Drupal/Core/Entity/ContentEntityDeleteForm.php b/core/lib/Drupal/Core/Entity/ContentEntityDeleteForm.php
index 5ef20387e8ea..4f9aff5d4698 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityDeleteForm.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityDeleteForm.php
@@ -39,7 +39,7 @@ class ContentEntityDeleteForm extends ContentEntityConfirmFormBase {
         $form['deleted_translations'] = [
           '#theme' => 'item_list',
           '#title' => $this->t('The following @entity-type translations will be deleted:', [
-            '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+            '@entity-type' => $entity->getEntityType()->getSingularLabel(),
           ]),
           '#items' => $languages,
         ];
@@ -96,7 +96,7 @@ class ContentEntityDeleteForm extends ContentEntityConfirmFormBase {
 
     if (!$entity->isDefaultTranslation()) {
       return $this->t('The @entity-type %label @language translation has been deleted.', [
-        '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+        '@entity-type' => $entity->getEntityType()->getSingularLabel(),
         '%label'       => $entity->label(),
         '@language'    => $entity->language()->getName(),
       ]);
@@ -114,7 +114,7 @@ class ContentEntityDeleteForm extends ContentEntityConfirmFormBase {
 
     if (!$entity->isDefaultTranslation()) {
       $this->logger($entity->getEntityType()->getProvider())->notice('The @entity-type %label @language translation has been deleted.', [
-        '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+        '@entity-type' => $entity->getEntityType()->getSingularLabel(),
         '%label'       => $entity->label(),
         '@language'    => $entity->language()->getName(),
       ]);
@@ -134,7 +134,7 @@ class ContentEntityDeleteForm extends ContentEntityConfirmFormBase {
     if (!$entity->isDefaultTranslation()) {
       return $this->t('Are you sure you want to delete the @language translation of the @entity-type %label?', [
         '@language' => $entity->language()->getName(),
-        '@entity-type' => $this->getEntity()->getEntityType()->getLowercaseLabel(),
+        '@entity-type' => $this->getEntity()->getEntityType()->getSingularLabel(),
         '%label' => $this->getEntity()->label(),
       ]);
     }
diff --git a/core/lib/Drupal/Core/Entity/Controller/EntityController.php b/core/lib/Drupal/Core/Entity/Controller/EntityController.php
index c7f1a69f2d33..8636f1d44243 100644
--- a/core/lib/Drupal/Core/Entity/Controller/EntityController.php
+++ b/core/lib/Drupal/Core/Entity/Controller/EntityController.php
@@ -148,7 +148,7 @@ class EntityController implements ContainerInjectionInterface {
     if ($bundle_entity_type_id) {
       $bundle_argument = $bundle_entity_type_id;
       $bundle_entity_type = $this->entityTypeManager->getDefinition($bundle_entity_type_id);
-      $bundle_entity_type_label = $bundle_entity_type->getLowercaseLabel();
+      $bundle_entity_type_label = $bundle_entity_type->getSingularLabel();
       $build['#cache']['tags'] = $bundle_entity_type->getListCacheTags();
 
       // Build the message shown when there are no bundles.
@@ -204,7 +204,7 @@ class EntityController implements ContainerInjectionInterface {
    */
   public function addTitle($entity_type_id) {
     $entity_type = $this->entityTypeManager->getDefinition($entity_type_id);
-    return $this->t('Add @entity-type', ['@entity-type' => $entity_type->getLowercaseLabel()]);
+    return $this->t('Add @entity-type', ['@entity-type' => $entity_type->getSingularLabel()]);
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Entity/EntityDeleteFormTrait.php b/core/lib/Drupal/Core/Entity/EntityDeleteFormTrait.php
index 4800f70cb365..7832a2590e54 100644
--- a/core/lib/Drupal/Core/Entity/EntityDeleteFormTrait.php
+++ b/core/lib/Drupal/Core/Entity/EntityDeleteFormTrait.php
@@ -45,7 +45,7 @@ trait EntityDeleteFormTrait {
    */
   public function getQuestion() {
     return $this->t('Are you sure you want to delete the @entity-type %label?', [
-      '@entity-type' => $this->getEntity()->getEntityType()->getLowercaseLabel(),
+      '@entity-type' => $this->getEntity()->getEntityType()->getSingularLabel(),
       '%label' => $this->getEntity()->label(),
     ]);
   }
@@ -66,7 +66,7 @@ trait EntityDeleteFormTrait {
   protected function getDeletionMessage() {
     $entity = $this->getEntity();
     return $this->t('The @entity-type %label has been deleted.', [
-      '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+      '@entity-type' => $entity->getEntityType()->getSingularLabel(),
       '%label' => $entity->label(),
     ]);
   }
@@ -110,7 +110,7 @@ trait EntityDeleteFormTrait {
   protected function logDeletionMessage() {
     $entity = $this->getEntity();
     $this->logger($entity->getEntityType()->getProvider())->notice('The @entity-type %label has been deleted.', [
-      '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+      '@entity-type' => $entity->getEntityType()->getSingularLabel(),
       '%label' => $entity->label(),
     ]);
   }
diff --git a/core/lib/Drupal/Core/Entity/EntityType.php b/core/lib/Drupal/Core/Entity/EntityType.php
index 388ea31a5467..f4c6d991d26f 100644
--- a/core/lib/Drupal/Core/Entity/EntityType.php
+++ b/core/lib/Drupal/Core/Entity/EntityType.php
@@ -775,6 +775,7 @@ class EntityType extends PluginDefinition implements EntityTypeInterface {
    * {@inheritdoc}
    */
   public function getLowercaseLabel() {
+    @trigger_error('EntityType::getLowercaseLabel() is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Instead, you should call getSingularLabel(). See https://www.drupal.org/node/3075567', E_USER_DEPRECATED);
     return mb_strtolower($this->getLabel());
   }
 
@@ -794,7 +795,7 @@ class EntityType extends PluginDefinition implements EntityTypeInterface {
    */
   public function getSingularLabel() {
     if (empty($this->label_singular)) {
-      $lowercase_label = $this->getLowercaseLabel();
+      $lowercase_label = mb_strtolower($this->getLabel());
       $this->label_singular = $lowercase_label;
     }
     return $this->label_singular;
@@ -805,7 +806,7 @@ class EntityType extends PluginDefinition implements EntityTypeInterface {
    */
   public function getPluralLabel() {
     if (empty($this->label_plural)) {
-      $lowercase_label = $this->getLowercaseLabel();
+      $lowercase_label = $this->getSingularLabel();
       $this->label_plural = new TranslatableMarkup('@label entities', ['@label' => $lowercase_label], [], $this->getStringTranslation());
     }
     return $this->label_plural;
@@ -816,7 +817,7 @@ class EntityType extends PluginDefinition implements EntityTypeInterface {
    */
   public function getCountLabel($count) {
     if (empty($this->label_count)) {
-      return $this->formatPlural($count, '@count @label', '@count @label entities', ['@label' => $this->getLowercaseLabel()], ['context' => 'Entity type label']);
+      return $this->formatPlural($count, '@count @label', '@count @label entities', ['@label' => $this->getSingularLabel()], ['context' => 'Entity type label']);
     }
     $context = isset($this->label_count['context']) ? $this->label_count['context'] : 'Entity type label';
     return $this->formatPlural($count, $this->label_count['singular'], $this->label_count['plural'], ['context' => $context]);
diff --git a/core/lib/Drupal/Core/Entity/EntityTypeInterface.php b/core/lib/Drupal/Core/Entity/EntityTypeInterface.php
index 3a6702281da4..dafaf3cdc5ee 100644
--- a/core/lib/Drupal/Core/Entity/EntityTypeInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityTypeInterface.php
@@ -659,6 +659,10 @@ interface EntityTypeInterface extends PluginDefinitionInterface {
    * @return string
    *   The lowercase form of the human-readable entity type name.
    *
+   * @deprecated deprecated in drupal:8.8.0 and is removed from drupal:9.0.0.
+   *   Instead, you should call getSingularLabel().
+   *   See https://www.drupal.org/node/3075567
+   *
    * @see \Drupal\Core\Entity\EntityTypeInterface::getLabel()
    */
   public function getLowercaseLabel();
@@ -684,6 +688,9 @@ interface EntityTypeInterface extends PluginDefinitionInterface {
    * "opportunities"), "child" (with the plural as "children"), or "content
    * item" (with the plural as "content items").
    *
+   * Think of it as an "in a full sentence, this is what we call this" label. As
+   * a consequence, the English version is lowercase.
+   *
    * @return string|\Drupal\Core\StringTranslation\TranslatableMarkup
    *   The singular label.
    */
diff --git a/core/lib/Drupal/Core/Entity/Form/DeleteMultipleForm.php b/core/lib/Drupal/Core/Entity/Form/DeleteMultipleForm.php
index aea3291bd430..2ff504cef15c 100644
--- a/core/lib/Drupal/Core/Entity/Form/DeleteMultipleForm.php
+++ b/core/lib/Drupal/Core/Entity/Form/DeleteMultipleForm.php
@@ -259,7 +259,7 @@ class DeleteMultipleForm extends ConfirmFormBase implements BaseFormIdInterface
       $storage->delete($delete_entities);
       foreach ($delete_entities as $entity) {
         $this->logger($entity->getEntityType()->getProvider())->notice('The @entity-type %label has been deleted.', [
-          '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+          '@entity-type' => $entity->getEntityType()->getSingularLabel(),
           '%label' => $entity->label(),
         ]);
       }
@@ -275,7 +275,7 @@ class DeleteMultipleForm extends ConfirmFormBase implements BaseFormIdInterface
         $entity->save();
         foreach ($translations as $translation) {
           $this->logger($entity->getEntityType()->getProvider())->notice('The @entity-type %label @language translation has been deleted.', [
-            '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+            '@entity-type' => $entity->getEntityType()->getSingularLabel(),
             '%label'       => $entity->label(),
             '@language'    => $translation->language()->getName(),
           ]);
diff --git a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php
index 3c34ec9665e2..d2b1741a3a08 100644
--- a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php
+++ b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php
@@ -41,7 +41,7 @@ class UniqueFieldValueValidator extends ConstraintValidator {
     if ($value_taken) {
       $this->context->addViolation($constraint->message, [
         '%value' => $item->value,
-        '@entity_type' => $entity->getEntityType()->getLowercaseLabel(),
+        '@entity_type' => $entity->getEntityType()->getSingularLabel(),
         '@field_name' => mb_strtolower($items->getFieldDefinition()->getLabel()),
       ]);
     }
diff --git a/core/modules/block/src/Form/BlockDeleteForm.php b/core/modules/block/src/Form/BlockDeleteForm.php
index e128ea7e7ec2..69322062a0dc 100644
--- a/core/modules/block/src/Form/BlockDeleteForm.php
+++ b/core/modules/block/src/Form/BlockDeleteForm.php
@@ -31,7 +31,7 @@ class BlockDeleteForm extends EntityDeleteForm {
    */
   public function getQuestion() {
     return $this->t('Are you sure you want to remove the @entity-type %label?', [
-      '@entity-type' => $this->getEntity()->getEntityType()->getLowercaseLabel(),
+      '@entity-type' => $this->getEntity()->getEntityType()->getSingularLabel(),
       '%label' => $this->getEntity()->label(),
     ]);
   }
@@ -42,7 +42,7 @@ class BlockDeleteForm extends EntityDeleteForm {
   protected function getDeletionMessage() {
     $entity = $this->getEntity();
     return $this->t('The @entity-type %label has been removed.', [
-      '@entity-type' => $entity->getEntityType()->getLowercaseLabel(),
+      '@entity-type' => $entity->getEntityType()->getSingularLabel(),
       '%label' => $entity->label(),
     ]);
   }
diff --git a/core/modules/config/src/Form/ConfigSingleImportForm.php b/core/modules/config/src/Form/ConfigSingleImportForm.php
index 3072999149dc..8d80f1fb595d 100644
--- a/core/modules/config/src/Form/ConfigSingleImportForm.php
+++ b/core/modules/config/src/Form/ConfigSingleImportForm.php
@@ -219,7 +219,7 @@ class ConfigSingleImportForm extends ConfirmFormBase {
     else {
       $definition = $this->entityTypeManager->getDefinition($this->data['config_type']);
       $name = $this->data['import'][$definition->getKey('id')];
-      $type = $definition->getLowercaseLabel();
+      $type = $definition->getSingularLabel();
     }
 
     $args = [
diff --git a/core/modules/config_translation/config_translation.module b/core/modules/config_translation/config_translation.module
index 5ca9313f717c..e22ecd82702f 100644
--- a/core/modules/config_translation/config_translation.module
+++ b/core/modules/config_translation/config_translation.module
@@ -142,7 +142,7 @@ function config_translation_config_translation_info(&$info) {
     $info[$entity_type_id] = [
       'class' => '\Drupal\config_translation\ConfigEntityMapper',
       'base_route_name' => $base_route_name,
-      'title' => $entity_type->getLowercaseLabel(),
+      'title' => $entity_type->getSingularLabel(),
       'names' => [],
       'entity_type' => $entity_type_id,
       'weight' => 10,
diff --git a/core/modules/config_translation/tests/src/Functional/ConfigTranslationOverviewTest.php b/core/modules/config_translation/tests/src/Functional/ConfigTranslationOverviewTest.php
index ec90074d7101..45f6636b37cd 100644
--- a/core/modules/config_translation/tests/src/Functional/ConfigTranslationOverviewTest.php
+++ b/core/modules/config_translation/tests/src/Functional/ConfigTranslationOverviewTest.php
@@ -110,13 +110,13 @@ class ConfigTranslationOverviewTest extends BrowserTestBase {
       $entity_type = \Drupal::entityTypeManager()->getDefinition($test_entity->getEntityTypeId());
       $this->drupalGet($base_url . '/translate');
 
-      $title = $test_entity->label() . ' ' . $entity_type->getLowercaseLabel();
+      $title = $test_entity->label() . ' ' . $entity_type->getSingularLabel();
       $title = 'Translations for <em class="placeholder">' . Html::escape($title) . '</em>';
       $this->assertRaw($title);
       $this->assertRaw('<th>' . t('Language') . '</th>');
 
       $this->drupalGet($base_url);
-      $this->assertLink(t('Translate @title', ['@title' => $entity_type->getLowercaseLabel()]));
+      $this->assertLink(t('Translate @title', ['@title' => $entity_type->getSingularLabel()]));
     }
   }
 
diff --git a/core/modules/content_translation/src/ContentTranslationPermissions.php b/core/modules/content_translation/src/ContentTranslationPermissions.php
index b2dcb6394e29..ab298f5f0a17 100644
--- a/core/modules/content_translation/src/ContentTranslationPermissions.php
+++ b/core/modules/content_translation/src/ContentTranslationPermissions.php
@@ -85,7 +85,7 @@ class ContentTranslationPermissions implements ContainerInjectionInterface {
     // bundle.
     foreach ($this->entityTypeManager->getDefinitions() as $entity_type_id => $entity_type) {
       if ($permission_granularity = $entity_type->getPermissionGranularity()) {
-        $t_args = ['@entity_label' => $entity_type->getLowercaseLabel()];
+        $t_args = ['@entity_label' => $entity_type->getSingularLabel()];
 
         switch ($permission_granularity) {
           case 'bundle':
diff --git a/core/modules/field_ui/src/EntityDisplayModeListBuilder.php b/core/modules/field_ui/src/EntityDisplayModeListBuilder.php
index f5eabc70b27c..2591dff45205 100644
--- a/core/modules/field_ui/src/EntityDisplayModeListBuilder.php
+++ b/core/modules/field_ui/src/EntityDisplayModeListBuilder.php
@@ -117,7 +117,7 @@ class EntityDisplayModeListBuilder extends ConfigEntityListBuilder {
         'data' => [
           '#type' => 'link',
           '#url' => Url::fromRoute($short_type == 'view' ? 'entity.entity_view_mode.add_form' : 'entity.entity_form_mode.add_form', ['entity_type_id' => $entity_type]),
-          '#title' => $this->t('Add new @entity-type %label', ['@entity-type' => $this->entityTypes[$entity_type]->getLabel(), '%label' => $this->entityType->getLowercaseLabel()]),
+          '#title' => $this->t('Add new @entity-type %label', ['@entity-type' => $this->entityTypes[$entity_type]->getLabel(), '%label' => $this->entityType->getSingularLabel()]),
         ],
         'colspan' => count($table['#header']),
       ];
diff --git a/core/modules/field_ui/src/Form/EntityDisplayModeAddForm.php b/core/modules/field_ui/src/Form/EntityDisplayModeAddForm.php
index a71b71361e3e..7099a362914f 100644
--- a/core/modules/field_ui/src/Form/EntityDisplayModeAddForm.php
+++ b/core/modules/field_ui/src/Form/EntityDisplayModeAddForm.php
@@ -28,7 +28,7 @@ class EntityDisplayModeAddForm extends EntityDisplayModeFormBase {
     // Change replace_pattern to avoid undesired dots.
     $form['id']['#machine_name']['replace_pattern'] = '[^a-z0-9_]+';
     $definition = $this->entityTypeManager->getDefinition($this->targetEntityTypeId);
-    $form['#title'] = $this->t('Add new @entity-type %label', ['@entity-type' => $definition->getLabel(), '%label' => $this->entityType->getLowercaseLabel()]);
+    $form['#title'] = $this->t('Add new @entity-type %label', ['@entity-type' => $definition->getLabel(), '%label' => $this->entityType->getSingularLabel()]);
     return $form;
   }
 
diff --git a/core/modules/field_ui/src/Form/EntityDisplayModeDeleteForm.php b/core/modules/field_ui/src/Form/EntityDisplayModeDeleteForm.php
index 1dc7633a68e3..44d022846df0 100644
--- a/core/modules/field_ui/src/Form/EntityDisplayModeDeleteForm.php
+++ b/core/modules/field_ui/src/Form/EntityDisplayModeDeleteForm.php
@@ -16,7 +16,7 @@ class EntityDisplayModeDeleteForm extends EntityDeleteForm {
    */
   public function getDescription() {
     $entity_type = $this->entity->getEntityType();
-    return $this->t('Deleting a @entity-type will cause any output still requesting to use that @entity-type to use the default display settings.', ['@entity-type' => $entity_type->getLowercaseLabel()]);
+    return $this->t('Deleting a @entity-type will cause any output still requesting to use that @entity-type to use the default display settings.', ['@entity-type' => $entity_type->getSingularLabel()]);
   }
 
 }
diff --git a/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php b/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php
index 461a74d8ed27..6ae2e5f27951 100644
--- a/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php
+++ b/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php
@@ -78,7 +78,7 @@ abstract class EntityDisplayModeFormBase extends EntityForm {
    * {@inheritdoc}
    */
   public function save(array $form, FormStateInterface $form_state) {
-    $this->messenger()->addStatus($this->t('Saved the %label @entity-type.', ['%label' => $this->entity->label(), '@entity-type' => $this->entityType->getLowercaseLabel()]));
+    $this->messenger()->addStatus($this->t('Saved the %label @entity-type.', ['%label' => $this->entity->label(), '@entity-type' => $this->entityType->getSingularLabel()]));
     $this->entity->save();
     \Drupal::service('entity_field.manager')->clearCachedFieldDefinitions();
     $form_state->setRedirectUrl($this->entity->toUrl('collection'));
diff --git a/core/modules/views/views.views.inc b/core/modules/views/views.views.inc
index 39a8f7239cf4..40af91805c9c 100644
--- a/core/modules/views/views.views.inc
+++ b/core/modules/views/views.views.inc
@@ -811,7 +811,7 @@ function core_field_views_data(FieldStorageConfigInterface $field_storage) {
     // Provide a reverse relationship for the entity type that is referenced by
     // the field.
     $args['@entity'] = $entity_type->getLabel();
-    $args['@label'] = $target_entity_type->getLowercaseLabel();
+    $args['@label'] = $target_entity_type->getSingularLabel();
     $pseudo_field_name = 'reverse__' . $entity_type_id . '__' . $field_name;
     $data[$target_base_table][$pseudo_field_name]['relationship'] = [
       'title' => t('@entity using @field_name', $args),
diff --git a/core/tests/Drupal/KernelTests/Core/Validation/UniqueFieldConstraintTest.php b/core/tests/Drupal/KernelTests/Core/Validation/UniqueFieldConstraintTest.php
index 3fbdf4e14143..2b5782c54226 100644
--- a/core/tests/Drupal/KernelTests/Core/Validation/UniqueFieldConstraintTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Validation/UniqueFieldConstraintTest.php
@@ -84,7 +84,7 @@ class UniqueFieldConstraintTest extends KernelTestBase {
 
     $message = new FormattableMarkup('A @entity_type with @field_name %value already exists.', [
       '%value' => $value,
-      '@entity_type' => $entity->getEntityType()->getLowercaseLabel(),
+      '@entity_type' => $entity->getEntityType()->getSingularLabel(),
       '@field_name' => 'name',
     ]);