danielveza
--- a/core/lib/Drupal/Core/Session/UserSession.php
+++ b/core/lib/Drupal/Core/Session/UserSession.php
+   */
+  public function __get($name): mixed {
+    if ($name === 'name') {
+      @trigger_error("Getting the name property is deprecated in drupal:11.2.0 and is removed from drupal:12.0.0. Use \Drupal\Core\Session\UserSession::getAccountName() instead. See https://www.drupal.org/node/3513856", E_USER_DEPRECATED);
+      return $this->getAccountName();
+    }
+    return $this->$name ?? NULL;
+  }
+
+  /**
+   * Implements magic __isset() method.
+   */
+  public function __isset($name): bool {
+    if ($name === 'name') {
+      @trigger_error("Checking for the name property is deprecated in drupal:11.2.0 and is removed from drupal:12.0.0. Use \Drupal\Core\Session\UserSession::getAccountName() instead. See https://www.drupal.org/node/3513856", E_USER_DEPRECATED);
+      return $this->getAccountName();
--- a/core/tests/Drupal/Tests/Core/Session/UserSessionTest.php
+++ b/core/tests/Drupal/Tests/Core/Session/UserSessionTest.php

+  /**
+   * Tests the name property deprecation.
+   *
+   * @covers ::__get
+   * @covers ::__isset
+   */
+  #[IgnoreDeprecations]
+  public function testNamePropertyDeprecation(): void {
+    $user = new UserSession([
+      'name' => 'test',
+    ]);
+    $this->expectDeprecation('Getting the name property is deprecated in drupal:11.2.0 and is removed from drupal:12.0.0. Use \Drupal\Core\Session\UserSession::getAccountName() instead. See https://www.drupal.org/node/3513856');
+    self::assertEquals($user->name, $user->getAccountName());
+    $this->expectDeprecation('Checking for the name property is deprecated in drupal:11.2.0 and is removed from drupal:12.0.0. Use \Drupal\Core\Session\UserSession::getAccountName() instead. See https://www.drupal.org/node/3513856');
+    $this->assertTrue(isset($user->name));