diff --git a/homeassistant/components/google_assistant/helpers.py b/homeassistant/components/google_assistant/helpers.py
index 3351af94648..9d06af2555a 100644
--- a/homeassistant/components/google_assistant/helpers.py
+++ b/homeassistant/components/google_assistant/helpers.py
@@ -52,7 +52,11 @@ LOCAL_SDK_MIN_VERSION = AwesomeVersion("2.1.5")
 @callback
 def _get_registry_entries(
     hass: HomeAssistant, entity_id: str
-) -> tuple[device_registry.DeviceEntry | None, area_registry.AreaEntry | None]:
+) -> tuple[
+    entity_registry.RegistryEntry | None,
+    device_registry.DeviceEntry | None,
+    area_registry.AreaEntry | None,
+]:
     """Get registry entries."""
     ent_reg = entity_registry.async_get(hass)
     dev_reg = device_registry.async_get(hass)
@@ -75,7 +79,7 @@ def _get_registry_entries(
     else:
         area_entry = None
 
-    return device_entry, area_entry
+    return entity_entry, device_entry, area_entry
 
 
 class AbstractConfig(ABC):
@@ -588,7 +592,9 @@ class GoogleEntity:
         name = (entity_config.get(CONF_NAME) or state.name).strip()
 
         # Find entity/device/area registry entries
-        device_entry, area_entry = _get_registry_entries(self.hass, self.entity_id)
+        entity_entry, device_entry, area_entry = _get_registry_entries(
+            self.hass, self.entity_id
+        )
 
         # Build the device info
         device = {
@@ -603,8 +609,12 @@ class GoogleEntity:
         }
 
         # Add aliases
-        if aliases := entity_config.get(CONF_ALIASES):
-            device["name"]["nicknames"] = [name] + aliases
+        if (config_aliases := entity_config.get(CONF_ALIASES, [])) or (
+            entity_entry and entity_entry.aliases
+        ):
+            device["name"]["nicknames"] = [name] + config_aliases
+            if entity_entry:
+                device["name"]["nicknames"].extend(entity_entry.aliases)
 
         # Add local SDK info if enabled
         if self.config.is_local_sdk_active and self.should_expose_local():
diff --git a/tests/components/google_assistant/test_smart_home.py b/tests/components/google_assistant/test_smart_home.py
index af61cfedf40..26b85f19c58 100644
--- a/tests/components/google_assistant/test_smart_home.py
+++ b/tests/components/google_assistant/test_smart_home.py
@@ -3,6 +3,7 @@ import asyncio
 from unittest.mock import ANY, call, patch
 
 import pytest
+from pytest_unordered import unordered
 
 from homeassistant.components import camera
 from homeassistant.components.climate import ATTR_MAX_TEMP, ATTR_MIN_TEMP, HVACMode
@@ -101,10 +102,21 @@ async def test_async_handle_message(hass):
     await hass.async_block_till_done()
 
 
-async def test_sync_message(hass):
+async def test_sync_message(hass, registries):
     """Test a sync message."""
+    entity = registries.entity.async_get_or_create(
+        "light",
+        "test",
+        "unique-demo-light",
+        suggested_object_id="demo_light",
+    )
+    registries.entity.async_update_entity(
+        entity.entity_id,
+        aliases={"Stay", "Healthy"},
+    )
+
     light = DemoLight(
-        None,
+        "unique-demo-light",
         "Demo Light",
         state=False,
         hs_color=(180, 75),
@@ -150,7 +162,15 @@ async def test_sync_message(hass):
                     "id": "light.demo_light",
                     "name": {
                         "name": "Demo Light",
-                        "nicknames": ["Demo Light", "Hello", "World"],
+                        "nicknames": unordered(
+                            [
+                                "Demo Light",
+                                "Hello",
+                                "World",
+                                "Stay",
+                                "Healthy",
+                            ]
+                        ),
                     },
                     "traits": [
                         trait.TRAIT_BRIGHTNESS,
@@ -181,7 +201,10 @@ async def test_sync_message(hass):
                                     {
                                         "setting_name": "none",
                                         "setting_values": [
-                                            {"lang": "en", "setting_synonym": ["none"]}
+                                            {
+                                                "lang": "en",
+                                                "setting_synonym": ["none"],
+                                            }
                                         ],
                                     },
                                 ],