diff --git a/homeassistant/components/ecovacs/vacuum.py b/homeassistant/components/ecovacs/vacuum.py
index 401274609d8..16cf5687720 100644
--- a/homeassistant/components/ecovacs/vacuum.py
+++ b/homeassistant/components/ecovacs/vacuum.py
@@ -26,6 +26,7 @@ from homeassistant.components.vacuum import (
 from homeassistant.core import HomeAssistant, SupportsResponse
 from homeassistant.exceptions import ServiceValidationError
 from homeassistant.helpers import entity_platform
+from homeassistant.helpers.device_registry import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.icon import icon_for_battery_level
 from homeassistant.util import slugify
@@ -75,6 +76,7 @@ class EcovacsLegacyVacuum(StateVacuumEntity):
     """Legacy Ecovacs vacuums."""
 
     _attr_fan_speed_list = [sucks.FAN_SPEED_NORMAL, sucks.FAN_SPEED_HIGH]
+    _attr_has_entity_name = True
     _attr_should_poll = False
     _attr_supported_features = (
         VacuumEntityFeature.BATTERY
@@ -95,7 +97,16 @@ class EcovacsLegacyVacuum(StateVacuumEntity):
 
         self.error: str | None = None
         self._attr_unique_id = vacuum["did"]
-        self._attr_name = vacuum.get("nick", vacuum["did"])
+
+        if (name := vacuum.get("nick")) is None:
+            name = vacuum.get("name", vacuum["did"])
+
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, vacuum["did"])},
+            model=vacuum.get("deviceName"),
+            name=name,
+            serial_number=vacuum["did"],
+        )
 
     async def async_added_to_hass(self) -> None:
         """Set up the event listeners now that hass is ready."""
diff --git a/tests/components/ecovacs/conftest.py b/tests/components/ecovacs/conftest.py
index 59721b65563..e53cfcc8a3d 100644
--- a/tests/components/ecovacs/conftest.py
+++ b/tests/components/ecovacs/conftest.py
@@ -117,6 +117,27 @@ def mock_mqtt_client(mock_authenticator: Mock) -> Generator[Mock]:
         yield client
 
 
+@pytest.fixture
+def mock_vacbot(device_fixture: str) -> Generator[Mock]:
+    """Mock the legacy VacBot."""
+    with patch(
+        "homeassistant.components.ecovacs.controller.VacBot",
+        autospec=True,
+    ) as mock:
+        vacbot = mock.return_value
+        vacbot.vacuum = load_json_object_fixture(
+            f"devices/{device_fixture}/device.json", DOMAIN
+        )
+        vacbot.statusEvents = Mock()
+        vacbot.batteryEvents = Mock()
+        vacbot.lifespanEvents = Mock()
+        vacbot.errorEvents = Mock()
+        vacbot.battery_status = None
+        vacbot.fan_speed = None
+        vacbot.components = {}
+        yield vacbot
+
+
 @pytest.fixture
 def mock_device_execute() -> Generator[AsyncMock]:
     """Mock the device execute function."""
diff --git a/tests/components/ecovacs/fixtures/devices/123/device.json b/tests/components/ecovacs/fixtures/devices/123/device.json
new file mode 100644
index 00000000000..07bdf01b156
--- /dev/null
+++ b/tests/components/ecovacs/fixtures/devices/123/device.json
@@ -0,0 +1,23 @@
+{
+  "did": "E1234567890000000003",
+  "name": "E1234567890000000003",
+  "class": "123",
+  "resource": "atom",
+  "company": "eco-legacy",
+  "deviceName": "DEEBOT Slim2 Series",
+  "icon": "https://portal-ww.ecouser.net/api/pim/file/get/5d2c150dba13eb00013feaae",
+  "ota": false,
+  "UILogicId": "ECO_INTL_123",
+  "materialNo": "110-1639-0102",
+  "pid": "5cae9b201285190001685977",
+  "product_category": "DEEBOT",
+  "model": "Slim2",
+  "updateInfo": {
+    "needUpdate": false,
+    "changeLog": ""
+  },
+  "nick": null,
+  "homeSort": 9999,
+  "status": 2,
+  "otaUpgrade": {}
+}
diff --git a/tests/components/ecovacs/test_init.py b/tests/components/ecovacs/test_init.py
index 27d00a2d023..c0c475217c1 100644
--- a/tests/components/ecovacs/test_init.py
+++ b/tests/components/ecovacs/test_init.py
@@ -129,12 +129,15 @@ async def test_devices_in_dr(
         assert device_entry == snapshot(name=device.device_info["did"])
 
 
-@pytest.mark.usefixtures("entity_registry_enabled_by_default", "init_integration")
+@pytest.mark.usefixtures(
+    "entity_registry_enabled_by_default", "mock_vacbot", "init_integration"
+)
 @pytest.mark.parametrize(
     ("device_fixture", "entities"),
     [
         ("yna5x1", 26),
         ("5xu9h3", 24),
+        ("123", 1),
     ],
 )
 async def test_all_entities_loaded(