diff --git a/homeassistant/components/mobile_app/http_api.py b/homeassistant/components/mobile_app/http_api.py
index 7d8d6c28243..a5a96b83bc6 100644
--- a/homeassistant/components/mobile_app/http_api.py
+++ b/homeassistant/components/mobile_app/http_api.py
@@ -3,6 +3,7 @@ import secrets
 from typing import Dict
 
 from aiohttp.web import Request, Response
+import emoji
 from nacl.secret import SecretBox
 import voluptuous as vol
 
@@ -10,6 +11,7 @@ from homeassistant.components.http import HomeAssistantView
 from homeassistant.components.http.data_validator import RequestDataValidator
 from homeassistant.const import CONF_WEBHOOK_ID, HTTP_CREATED
 from homeassistant.helpers import config_validation as cv
+from homeassistant.util import slugify
 
 from .const import (
     ATTR_APP_DATA,
@@ -75,6 +77,20 @@ class RegistrationsView(HomeAssistantView):
 
         data[CONF_USER_ID] = request["hass_user"].id
 
+        if slugify(data[ATTR_DEVICE_NAME], separator=""):
+            # if slug is not empty and would not only be underscores
+            # use DEVICE_NAME
+            pass
+        elif emoji.emoji_count(data[ATTR_DEVICE_NAME]):
+            # If otherwise empty string contains emoji
+            # use descriptive name of the first emoji
+            data[ATTR_DEVICE_NAME] = emoji.demojize(
+                emoji.emoji_lis(data[ATTR_DEVICE_NAME])[0]["emoji"]
+            ).replace(":", "")
+        else:
+            # Fallback to DEVICE_ID
+            data[ATTR_DEVICE_NAME] = data[ATTR_DEVICE_ID]
+
         await hass.async_create_task(
             hass.config_entries.flow.async_init(
                 DOMAIN, data=data, context={"source": "registration"}
diff --git a/homeassistant/components/mobile_app/manifest.json b/homeassistant/components/mobile_app/manifest.json
index 477acbb2203..61e90e6bd8e 100644
--- a/homeassistant/components/mobile_app/manifest.json
+++ b/homeassistant/components/mobile_app/manifest.json
@@ -3,7 +3,7 @@
   "name": "Mobile App",
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/mobile_app",
-  "requirements": ["PyNaCl==1.3.0"],
+  "requirements": ["PyNaCl==1.3.0", "emoji==0.5.4"],
   "dependencies": ["http", "webhook", "person"],
   "after_dependencies": ["cloud", "camera"],
   "codeowners": ["@robbiet480"],
diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 464a3f38d6a..34d5935e71b 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -11,6 +11,7 @@ ciso8601==2.1.3
 cryptography==2.9.2
 defusedxml==0.6.0
 distro==1.5.0
+emoji==0.5.4
 hass-nabucasa==0.34.6
 home-assistant-frontend==20200620.0
 importlib-metadata==1.6.0;python_version<'3.8'
diff --git a/requirements_all.txt b/requirements_all.txt
index 5be8258bffe..ac3981f3ea3 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -528,6 +528,9 @@ eliqonline==1.2.2
 # homeassistant.components.elkm1
 elkm1-lib==0.7.18
 
+# homeassistant.components.mobile_app
+emoji==0.5.4
+
 # homeassistant.components.emulated_roku
 emulated_roku==0.2.1
 
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index b1f68c4431c..50feabcaead 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -244,6 +244,9 @@ elgato==0.2.0
 # homeassistant.components.elkm1
 elkm1-lib==0.7.18
 
+# homeassistant.components.mobile_app
+emoji==0.5.4
+
 # homeassistant.components.emulated_roku
 emulated_roku==0.2.1