diff --git a/esphome/core/entity_base.cpp b/esphome/core/entity_base.cpp
index 791b6615a1..cf91e17a6a 100644
--- a/esphome/core/entity_base.cpp
+++ b/esphome/core/entity_base.cpp
@@ -11,7 +11,14 @@ const StringRef &EntityBase::get_name() const { return this->name_; }
 void EntityBase::set_name(const char *name) {
   this->name_ = StringRef(name);
   if (this->name_.empty()) {
-    this->name_ = StringRef(App.get_friendly_name());
+#ifdef USE_DEVICES
+    if (this->device_ != nullptr) {
+      this->name_ = StringRef(this->device_->get_name());
+    } else
+#endif
+    {
+      this->name_ = StringRef(App.get_friendly_name());
+    }
     this->flags_.has_own_name = false;
   } else {
     this->flags_.has_own_name = true;
@@ -29,16 +36,21 @@ void EntityBase::set_icon(const char *icon) { this->icon_c_str_ = icon; }
 
 // Entity Object ID
 std::string EntityBase::get_object_id() const {
+  std::string suffix = "";
+#ifdef USE_DEVICES
+  if (this->device_ != nullptr) {
+    suffix = "@" + str_sanitize(str_snake_case(this->device_->get_name()));
+  }
+#endif
   // Check if `App.get_friendly_name()` is constant or dynamic.
   if (!this->flags_.has_own_name && App.is_name_add_mac_suffix_enabled()) {
     // `App.get_friendly_name()` is dynamic.
-    return str_sanitize(str_snake_case(App.get_friendly_name()));
-  } else {
-    // `App.get_friendly_name()` is constant.
+    return str_sanitize(str_snake_case(App.get_friendly_name())) + suffix;
+  } else {  // `App.get_friendly_name()` is constant.
     if (this->object_id_c_str_ == nullptr) {
-      return "";
+      return suffix;
     }
-    return this->object_id_c_str_;
+    return this->object_id_c_str_ + suffix;
   }
 }
 void EntityBase::set_object_id(const char *object_id) {
@@ -47,19 +59,7 @@ void EntityBase::set_object_id(const char *object_id) {
 }
 
 // Calculate Object ID Hash from Entity Name
-void EntityBase::calc_object_id_() {
-  // Check if `App.get_friendly_name()` is constant or dynamic.
-  if (!this->flags_.has_own_name && App.is_name_add_mac_suffix_enabled()) {
-    // `App.get_friendly_name()` is dynamic.
-    const auto object_id = str_sanitize(str_snake_case(App.get_friendly_name()));
-    // FNV-1 hash
-    this->object_id_hash_ = fnv1_hash(object_id);
-  } else {
-    // `App.get_friendly_name()` is constant.
-    // FNV-1 hash
-    this->object_id_hash_ = fnv1_hash(this->object_id_c_str_);
-  }
-}
+void EntityBase::calc_object_id_() { this->object_id_hash_ = fnv1_hash(this->get_object_id()); }
 
 uint32_t EntityBase::get_object_id_hash() { return this->object_id_hash_; }
 
diff --git a/esphome/core/entity_base.h b/esphome/core/entity_base.h
index 4bd04a9b1c..4819b66108 100644
--- a/esphome/core/entity_base.h
+++ b/esphome/core/entity_base.h
@@ -6,6 +6,10 @@
 #include "helpers.h"
 #include "log.h"
 
+#ifdef USE_DEVICES
+#include "device.h"
+#endif
+
 namespace esphome {
 
 enum EntityCategory : uint8_t {
@@ -53,8 +57,13 @@ class EntityBase {
 
 #ifdef USE_DEVICES
   // Get/set this entity's device id
-  uint32_t get_device_id() const { return this->device_id_; }
-  void set_device_id(const uint32_t device_id) { this->device_id_ = device_id; }
+  uint32_t get_device_id() const {
+    if (this->device_ == nullptr) {
+      return 0;  // No device set, return 0
+    }
+    return this->device_->get_device_id();
+  }
+  void set_device(Device *device) { this->device_ = device; }
 #endif
 
   // Check if this entity has state
@@ -74,7 +83,7 @@ class EntityBase {
   const char *icon_c_str_{nullptr};
   uint32_t object_id_hash_{};
 #ifdef USE_DEVICES
-  uint32_t device_id_{};
+  Device *device_{};
 #endif
 
   // Bit-packed flags to save memory (1 byte instead of 5)
diff --git a/esphome/cpp_helpers.py b/esphome/cpp_helpers.py
index 8d5440f591..e50be56092 100644
--- a/esphome/cpp_helpers.py
+++ b/esphome/cpp_helpers.py
@@ -17,7 +17,7 @@ from esphome.core import CORE, ID, coroutine
 from esphome.coroutine import FakeAwaitable
 from esphome.cpp_generator import add, get_variable
 from esphome.cpp_types import App
-from esphome.helpers import fnv1a_32bit_hash, sanitize, snake_case
+from esphome.helpers import sanitize, snake_case
 from esphome.types import ConfigFragmentType, ConfigType
 from esphome.util import Registry, RegistryEntry
 
@@ -99,6 +99,11 @@ async def register_parented(var, value):
 
 async def setup_entity(var, config):
     """Set up generic properties of an Entity"""
+    if CONF_DEVICE_ID in config:
+        device_id: ID = config[CONF_DEVICE_ID]
+        device = await get_variable(device_id)
+        add(var.set_device(device))
+
     add(var.set_name(config[CONF_NAME]))
     if not config[CONF_NAME]:
         add(var.set_object_id(sanitize(snake_case(CORE.friendly_name))))
@@ -111,9 +116,6 @@ async def setup_entity(var, config):
         add(var.set_icon(config[CONF_ICON]))
     if CONF_ENTITY_CATEGORY in config:
         add(var.set_entity_category(config[CONF_ENTITY_CATEGORY]))
-    if CONF_DEVICE_ID in config:
-        device_id: ID = config[CONF_DEVICE_ID]
-        add(var.set_device_id(fnv1a_32bit_hash(device_id.id)))
 
 
 def extract_registry_entry_config(