diff --git a/homeassistant/components/filesize/sensor.py b/homeassistant/components/filesize/sensor.py
index 6f7e31a1e67964..0b5c39f3629403 100644
--- a/homeassistant/components/filesize/sensor.py
+++ b/homeassistant/components/filesize/sensor.py
@@ -34,17 +34,17 @@
 SENSOR_TYPES = (
     SensorEntityDescription(
         key="file",
+        translation_key="size",
         icon=ICON,
-        name="Size",
         native_unit_of_measurement=UnitOfInformation.MEGABYTES,
         device_class=SensorDeviceClass.DATA_SIZE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     SensorEntityDescription(
         key="bytes",
+        translation_key="size_bytes",
         entity_registry_enabled_default=False,
         icon=ICON,
-        name="Size bytes",
         native_unit_of_measurement=UnitOfInformation.BYTES,
         device_class=SensorDeviceClass.DATA_SIZE,
         state_class=SensorStateClass.MEASUREMENT,
@@ -52,9 +52,9 @@
     ),
     SensorEntityDescription(
         key="last_updated",
+        translation_key="last_updated",
         entity_registry_enabled_default=False,
         icon=ICON,
-        name="Last Updated",
         device_class=SensorDeviceClass.TIMESTAMP,
         entity_category=EntityCategory.DIAGNOSTIC,
     ),
diff --git a/homeassistant/components/filesize/strings.json b/homeassistant/components/filesize/strings.json
index 90c286e7088800..3323c3411b26b2 100644
--- a/homeassistant/components/filesize/strings.json
+++ b/homeassistant/components/filesize/strings.json
@@ -15,5 +15,18 @@
       "already_configured": "[%key:common::config_flow::abort::already_configured_service%]"
     }
   },
-  "title": "Filesize"
+  "title": "Filesize",
+  "entity": {
+    "sensor": {
+      "size": {
+        "name": "Size"
+      },
+      "size_bytes": {
+        "name": "Size in bytes"
+      },
+      "last_updated": {
+        "name": "Last updated"
+      }
+    }
+  }
 }