diff --git a/homeassistant/components/homekit_controller/.translations/en.json b/homeassistant/components/homekit_controller/.translations/en.json
index 72aa720b449..eb994289a62 100644
--- a/homeassistant/components/homekit_controller/.translations/en.json
+++ b/homeassistant/components/homekit_controller/.translations/en.json
@@ -14,7 +14,7 @@
             "busy_error": "Device refused to add pairing as it is already pairing with another controller.",
             "max_peers_error": "Device refused to add pairing as it has no free pairing storage.",
             "max_tries_error": "Device refused to add pairing as it has received more than 100 unsuccessful authentication attempts.",
-            "pairing_failed": "An unhandled error occured while attempting to pair with this device. This may be a temporary failure or your device may not be supported currently.",
+            "pairing_failed": "An unhandled error occurred while attempting to pair with this device. This may be a temporary failure or your device may not be supported currently.",
             "unable_to_pair": "Unable to pair, please try again.",
             "unknown_error": "Device reported an unknown error. Pairing failed."
         },
diff --git a/homeassistant/components/homekit_controller/strings.json b/homeassistant/components/homekit_controller/strings.json
index 55718e35b59..80370717183 100644
--- a/homeassistant/components/homekit_controller/strings.json
+++ b/homeassistant/components/homekit_controller/strings.json
@@ -25,7 +25,7 @@
             "max_peers_error": "Device refused to add pairing as it has no free pairing storage.",
             "busy_error": "Device refused to add pairing as it is already pairing with another controller.",
             "max_tries_error": "Device refused to add pairing as it has received more than 100 unsuccessful authentication attempts.",
-            "pairing_failed": "An unhandled error occured while attempting to pair with this device. This may be a temporary failure or your device may not be supported currently."
+            "pairing_failed": "An unhandled error occurred while attempting to pair with this device. This may be a temporary failure or your device may not be supported currently."
         },
         "abort": {
             "no_devices": "No unpaired devices could be found",
diff --git a/homeassistant/components/system_log/__init__.py b/homeassistant/components/system_log/__init__.py
index 2ddf02f76ed..bf49de5a731 100644
--- a/homeassistant/components/system_log/__init__.py
+++ b/homeassistant/components/system_log/__init__.py
@@ -91,7 +91,7 @@ class LogEntry:
 
     def __init__(self, record, stack, source):
         """Initialize a log entry."""
-        self.first_occured = self.timestamp = record.created
+        self.first_occurred = self.timestamp = record.created
         self.name = record.name
         self.level = record.levelname
         self.message = deque([record.getMessage()], maxlen=5)
@@ -117,7 +117,7 @@ class LogEntry:
             "timestamp": self.timestamp,
             "exception": self.exception,
             "count": self.count,
-            "first_occured": self.first_occured,
+            "first_occurred": self.first_occurred,
         }
 
 
diff --git a/homeassistant/components/toon/.translations/en.json b/homeassistant/components/toon/.translations/en.json
index cea3146a3a5..7d7d6c73e16 100644
--- a/homeassistant/components/toon/.translations/en.json
+++ b/homeassistant/components/toon/.translations/en.json
@@ -5,7 +5,7 @@
             "client_secret": "The client secret from the configuration is invalid.",
             "no_agreements": "This account has no Toon displays.",
             "no_app": "You need to configure Toon before being able to authenticate with it. [Please read the instructions](https://www.home-assistant.io/components/toon/).",
-            "unknown_auth_fail": "Unexpected error occured, while authenticating."
+            "unknown_auth_fail": "Unexpected error occurred, while authenticating."
         },
         "error": {
             "credentials": "The provided credentials are invalid.",
diff --git a/homeassistant/components/toon/strings.json b/homeassistant/components/toon/strings.json
index 80d71d4e421..20d6ba3d72c 100644
--- a/homeassistant/components/toon/strings.json
+++ b/homeassistant/components/toon/strings.json
@@ -26,7 +26,7 @@
     "abort": {
       "client_id": "The client ID from the configuration is invalid.",
       "client_secret": "The client secret from the configuration is invalid.",
-      "unknown_auth_fail": "Unexpected error occured, while authenticating.",
+      "unknown_auth_fail": "Unexpected error occurred, while authenticating.",
       "no_agreements": "This account has no Toon displays.",
       "no_app": "You need to configure Toon before being able to authenticate with it. [Please read the instructions](https://www.home-assistant.io/components/toon/)."
     }
diff --git a/tests/components/system_log/test_init.py b/tests/components/system_log/test_init.py
index 9862260c5f8..92f0ed9fd16 100644
--- a/tests/components/system_log/test_init.py
+++ b/tests/components/system_log/test_init.py
@@ -157,7 +157,7 @@ async def test_dedup_logs(hass, hass_client):
     log_msg()
     log = await get_error_log(hass, hass_client, 3)
     assert_log(log[0], "", ["error message 2", "error message 2-2"], "ERROR")
-    assert log[0]["timestamp"] > log[0]["first_occured"]
+    assert log[0]["timestamp"] > log[0]["first_occurred"]
 
     log_msg("2-3")
     log_msg("2-4")