diff --git a/apps/files/lib/Activity/Provider.php b/apps/files/lib/Activity/Provider.php
index 07bc471281..56d9f750fd 100644
--- a/apps/files/lib/Activity/Provider.php
+++ b/apps/files/lib/Activity/Provider.php
@@ -28,6 +28,7 @@ use OCP\Activity\IEvent;
 use OCP\Activity\IEventMerger;
 use OCP\Activity\IManager;
 use OCP\Activity\IProvider;
+use OCP\Contacts\IManager as IContactsManager;
 use OCP\Files\Folder;
 use OCP\Files\InvalidPathException;
 use OCP\Files\IRootFolder;
@@ -64,25 +65,27 @@ class Provider implements IProvider {
 	/** @var IEventMerger */
 	protected $eventMerger;
 
+	/** @var IContactsManager */
+	protected $contactsManager;
+
 	/** @var string[] cached displayNames - key is the UID and value the displayname */
 	protected $displayNames = [];
 
 	protected $fileIsEncrypted = false;
 
-	/**
-	 * @param IFactory $languageFactory
-	 * @param IURLGenerator $url
-	 * @param IManager $activityManager
-	 * @param IUserManager $userManager
-	 * @param IRootFolder $rootFolder
-	 * @param IEventMerger $eventMerger
-	 */
-	public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager, IRootFolder $rootFolder, IEventMerger $eventMerger) {
+	public function __construct(IFactory $languageFactory,
+								IURLGenerator $url,
+								IManager $activityManager,
+								IUserManager $userManager,
+								IRootFolder $rootFolder,
+								IContactsManager $contactsManager,
+								IEventMerger $eventMerger) {
 		$this->languageFactory = $languageFactory;
 		$this->url = $url;
 		$this->activityManager = $activityManager;
 		$this->userManager = $userManager;
 		$this->rootFolder = $rootFolder;
+		$this->contactsManager = $contactsManager;
 		$this->eventMerger = $eventMerger;
 	}
 
@@ -499,8 +502,29 @@ class Provider implements IProvider {
 		$user = $this->userManager->get($uid);
 		if ($user instanceof IUser) {
 			return $user->getDisplayName();
-		} else {
-			return $uid;
 		}
+
+		$addressBookContacts = $this->contactsManager->search($uid, ['CLOUD']);
+		foreach ($addressBookContacts as $contact) {
+			if (isset($contact['isLocalSystemBook'])) {
+				continue;
+			}
+
+			if (isset($contact['CLOUD'])) {
+				$cloudIds = $contact['CLOUD'];
+				if (is_string($cloudIds)) {
+					$cloudIds = [$cloudIds];
+				}
+
+				$lowerSearch = strtolower($uid);
+				foreach ($cloudIds as $cloudId) {
+					if (strtolower($cloudId) === $lowerSearch) {
+						return $contact['FN'] . " ($cloudId)";
+					}
+				}
+			}
+		}
+
+		return $uid;
 	}
 }
diff --git a/apps/files_sharing/lib/Activity/Providers/Base.php b/apps/files_sharing/lib/Activity/Providers/Base.php
index 237e4c5f37..77ebfc2644 100644
--- a/apps/files_sharing/lib/Activity/Providers/Base.php
+++ b/apps/files_sharing/lib/Activity/Providers/Base.php
@@ -26,6 +26,7 @@ namespace OCA\Files_Sharing\Activity\Providers;
 use OCP\Activity\IEvent;
 use OCP\Activity\IManager;
 use OCP\Activity\IProvider;
+use OCP\Contacts\IManager as IContactsManager;
 use OCP\IL10N;
 use OCP\IURLGenerator;
 use OCP\IUser;
@@ -49,20 +50,22 @@ abstract class Base implements IProvider {
 	/** @var IUserManager */
 	protected $userManager;
 
+	/** @var IContactsManager */
+	protected $contactsManager;
+
 	/** @var array */
 	protected $displayNames = [];
 
-	/**
-	 * @param IFactory $languageFactory
-	 * @param IURLGenerator $url
-	 * @param IManager $activityManager
-	 * @param IUserManager $userManager
-	 */
-	public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager) {
+	public function __construct(IFactory $languageFactory,
+								IURLGenerator $url,
+								IManager $activityManager,
+								IUserManager $userManager,
+								IContactsManager $contactsManager) {
 		$this->languageFactory = $languageFactory;
 		$this->url = $url;
 		$this->activityManager = $activityManager;
 		$this->userManager = $userManager;
+		$this->contactsManager = $contactsManager;
 	}
 
 	/**
@@ -179,8 +182,33 @@ abstract class Base implements IProvider {
 		$user = $this->userManager->get($uid);
 		if ($user instanceof IUser) {
 			return $user->getDisplayName();
-		} else {
-			return $uid;
 		}
+
+		return $this->getDisplayNameForContact($uid);
+	}
+
+	protected function getDisplayNameForContact(string $search): string {
+		$addressBookContacts = $this->contactsManager->search($search, ['CLOUD']);
+		foreach ($addressBookContacts as $contact) {
+			if (isset($contact['isLocalSystemBook'])) {
+				continue;
+			}
+
+			if (isset($contact['CLOUD'])) {
+				$cloudIds = $contact['CLOUD'];
+				if (is_string($cloudIds)) {
+					$cloudIds = [$cloudIds];
+				}
+
+				$lowerSearch = strtolower($search);
+				foreach ($cloudIds as $cloudId) {
+					if (strtolower($cloudId) === $lowerSearch) {
+						return $contact['FN'] . " ($cloudId)";
+					}
+				}
+			}
+		}
+
+		return $search;
 	}
 }
diff --git a/apps/files_sharing/lib/Activity/Providers/Groups.php b/apps/files_sharing/lib/Activity/Providers/Groups.php
index 184e4a5b70..35fd03e0ca 100644
--- a/apps/files_sharing/lib/Activity/Providers/Groups.php
+++ b/apps/files_sharing/lib/Activity/Providers/Groups.php
@@ -26,6 +26,7 @@ namespace OCA\Files_Sharing\Activity\Providers;
 
 use OCP\Activity\IEvent;
 use OCP\Activity\IManager;
+use OCP\Contacts\IManager as IContactsManager;
 use OCP\IGroup;
 use OCP\IGroupManager;
 use OCP\IURLGenerator;
@@ -48,15 +49,13 @@ class Groups extends Base {
 	/** @var string[] */
 	protected $groupDisplayNames = [];
 
-	/**
-	 * @param IFactory $languageFactory
-	 * @param IURLGenerator $url
-	 * @param IManager $activityManager
-	 * @param IUserManager $userManager
-	 * @param IGroupManager $groupManager
-	 */
-	public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager, IGroupManager $groupManager) {
-		parent::__construct($languageFactory, $url, $activityManager, $userManager);
+	public function __construct(IFactory $languageFactory,
+								IURLGenerator $url,
+								IManager $activityManager,
+								IUserManager $userManager,
+								IContactsManager $contactsManager,
+								IGroupManager $groupManager) {
+		parent::__construct($languageFactory, $url, $activityManager, $userManager, $contactsManager);
 		$this->groupManager = $groupManager;
 	}
 
diff --git a/apps/files_sharing/lib/Activity/Providers/RemoteShares.php b/apps/files_sharing/lib/Activity/Providers/RemoteShares.php
index 2bdf36f7ee..28c62845f8 100644
--- a/apps/files_sharing/lib/Activity/Providers/RemoteShares.php
+++ b/apps/files_sharing/lib/Activity/Providers/RemoteShares.php
@@ -26,6 +26,7 @@ namespace OCA\Files_Sharing\Activity\Providers;
 
 use OCP\Activity\IEvent;
 use OCP\Activity\IManager;
+use OCP\Contacts\IManager as IContactsManager;
 use OCP\Federation\ICloudIdManager;
 use OCP\IURLGenerator;
 use OCP\IUserManager;
@@ -40,20 +41,14 @@ class RemoteShares extends Base {
 	const SUBJECT_REMOTE_SHARE_RECEIVED = 'remote_share_received';
 	const SUBJECT_REMOTE_SHARE_UNSHARED = 'remote_share_unshared';
 
-	/**
-	 * @param IFactory $languageFactory
-	 * @param IURLGenerator $url
-	 * @param IManager $activityManager
-	 * @param IUserManager $userManager
-	 * @param ICloudIdManager $cloudIdManager
-	 */
 	public function __construct(IFactory $languageFactory,
 								IURLGenerator $url,
 								IManager $activityManager,
 								IUserManager $userManager,
+								IContactsManager $contactsManager,
 								ICloudIdManager $cloudIdManager
 	) {
-		parent::__construct($languageFactory, $url, $activityManager, $userManager);
+		parent::__construct($languageFactory, $url, $activityManager, $userManager, $contactsManager);
 		$this->cloudIdManager = $cloudIdManager;
 	}
 
@@ -153,7 +148,7 @@ class RemoteShares extends Base {
 		return [
 			'type' => 'user',
 			'id' => $remoteUser->getUser(),
-			'name' => $cloudId,// Todo display name from contacts
+			'name' => $this->getDisplayNameForContact($remoteUser->getDisplayId()),
 			'server' => $remoteUser->getRemote(),
 		];
 	}