diff --git a/esphome/core/entity_base.cpp b/esphome/core/entity_base.cpp
index 19ab57349d..3d61e36fd1 100644
--- a/esphome/core/entity_base.cpp
+++ b/esphome/core/entity_base.cpp
@@ -16,7 +16,6 @@ void EntityBase::set_name(const char *name) {
   } else {
     this->has_own_name_ = true;
   }
-  this->calc_object_id_();
 }
 
 // Entity Internal
@@ -41,13 +40,37 @@ EntityCategory EntityBase::get_entity_category() const { return this->entity_cat
 void EntityBase::set_entity_category(EntityCategory entity_category) { this->entity_category_ = entity_category; }
 
 // Entity Object ID
-const std::string &EntityBase::get_object_id() { return this->object_id_; }
+std::string EntityBase::get_object_id() const {
+  // Check if `App.get_friendly_name()` is constant or dynamic.
+  if (!this->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.
+    if (this->object_id_c_str_ == nullptr) {
+      return "";
+    }
+    return this->object_id_c_str_;
+  }
+}
+void EntityBase::set_object_id(const char *object_id) {
+  this->object_id_c_str_ = object_id;
+  this->calc_object_id_();
+}
 
 // Calculate Object ID Hash from Entity Name
 void EntityBase::calc_object_id_() {
-  this->object_id_ = str_sanitize(str_snake_case(this->name_));
-  // FNV-1 hash
-  this->object_id_hash_ = fnv1_hash(this->object_id_);
+  // Check if `App.get_friendly_name()` is constant or dynamic.
+  if (!this->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_);
+  }
 }
 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 e25aab21a9..0a53c3fccc 100644
--- a/esphome/core/entity_base.h
+++ b/esphome/core/entity_base.h
@@ -22,8 +22,9 @@ class EntityBase {
   // Get whether this Entity has its own name or it should use the device friendly_name.
   bool has_own_name() const { return this->has_own_name_; }
 
-  // Get the sanitized name of this Entity as an ID. Caching it internally.
-  const std::string &get_object_id();
+  // Get the sanitized name of this Entity as an ID.
+  std::string get_object_id() const;
+  void set_object_id(const char *object_id);
 
   // Get the unique Object ID of this Entity
   uint32_t get_object_id_hash();
@@ -54,7 +55,7 @@ class EntityBase {
 
   StringRef name_;
   bool has_own_name_{false};
-  std::string object_id_;
+  const char *object_id_c_str_{nullptr};
   const char *icon_c_str_{nullptr};
   uint32_t object_id_hash_;
   bool internal_{false};
diff --git a/esphome/cpp_helpers.py b/esphome/cpp_helpers.py
index ab5231e055..cc53f491f5 100644
--- a/esphome/cpp_helpers.py
+++ b/esphome/cpp_helpers.py
@@ -20,6 +20,7 @@ from esphome.types import ConfigType, ConfigFragmentType
 from esphome.cpp_generator import add, get_variable
 from esphome.cpp_types import App
 from esphome.util import Registry, RegistryEntry
+from esphome.helpers import snake_case, sanitize
 
 
 _LOGGER = logging.getLogger(__name__)
@@ -101,6 +102,10 @@ async def register_parented(var, value):
 async def setup_entity(var, config):
     """Set up generic properties of an Entity"""
     add(var.set_name(config[CONF_NAME]))
+    if not config[CONF_NAME]:
+        add(var.set_object_id(sanitize(snake_case(CORE.friendly_name))))
+    else:
+        add(var.set_object_id(sanitize(snake_case(config[CONF_NAME]))))
     add(var.set_disabled_by_default(config[CONF_DISABLED_BY_DEFAULT]))
     if CONF_INTERNAL in config:
         add(var.set_internal(config[CONF_INTERNAL]))
diff --git a/esphome/helpers.py b/esphome/helpers.py
index b5a6306342..884f640d7b 100644
--- a/esphome/helpers.py
+++ b/esphome/helpers.py
@@ -7,6 +7,7 @@ from pathlib import Path
 from typing import Union
 import tempfile
 from urllib.parse import urlparse
+import re
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -334,3 +335,13 @@ def add_class_to_obj(value, cls):
             if type(value) is type_:  # pylint: disable=unidiomatic-typecheck
                 return add_class_to_obj(func(value), cls)
         raise
+
+
+def snake_case(value):
+    """Same behaviour as `helpers.cpp` method `str_snake_case`."""
+    return value.replace(" ", "_").lower()
+
+
+def sanitize(value):
+    """Same behaviour as `helpers.cpp` method `str_sanitize`."""
+    return re.sub("[^-_0-9a-zA-Z]", r"", value)
diff --git a/tests/unit_tests/test_helpers.py b/tests/unit_tests/test_helpers.py
index f883b8b44f..b98838024f 100644
--- a/tests/unit_tests/test_helpers.py
+++ b/tests/unit_tests/test_helpers.py
@@ -229,3 +229,37 @@ def test_file_compare(fixture_path, file1, file2, expected):
     actual = helpers.file_compare(path1, path2)
 
     assert actual == expected
+
+
+@pytest.mark.parametrize(
+    "text, expected",
+    (
+        ("foo", "foo"),
+        ("foo bar", "foo_bar"),
+        ("foo Bar", "foo_bar"),
+        ("foo BAR", "foo_bar"),
+        ("foo.bar", "foo.bar"),
+        ("fooBAR", "foobar"),
+        ("Foo-bar_EEK", "foo-bar_eek"),
+        ("  foo", "__foo"),
+    ),
+)
+def test_snake_case(text, expected):
+    actual = helpers.snake_case(text)
+
+    assert actual == expected
+
+
+@pytest.mark.parametrize(
+    "text, expected",
+    (
+        ("foo_bar", "foo_bar"),
+        ('!"§$%&/()=?foo_bar', "foo_bar"),
+        ('foo_!"§$%&/()=?bar', "foo_bar"),
+        ('foo_bar!"§$%&/()=?', "foo_bar"),
+    ),
+)
+def test_sanitize(text, expected):
+    actual = helpers.sanitize(text)
+
+    assert actual == expected