The Photos app sorts photos and videos of people, dogs, and cats in the People & Pets collection (or the People collection if no pets appear). You can name a person, dog, or cat directly from a photo or video in your photo library, or in People & Pets.
When you name a person or pet in a photo or video, they’re automatically added to People & Pets and named in other photos and videos in your library.
Go to the Photos app
Tap Name This Person or Name This Pet, then enter their name.
Tap Done.
If the person or pet you want to name doesn’t appear, tap Add People at the bottom of People & Pets to see more faces.
To create and edit groups, see on your iPhone.
Tap People & Pets.
Touch and hold a person or pet, then tap Favorite.
To unfavorite a person or pet, touch and hold their key photo in People & Pets, then tap Unfavorite.
Go to the Photos app on your iPhone.
Tap People & Pets, tap Sort, then choose one of the following:
Sort alphabetically: Tap Name.
Sort manually: Tap Custom, then touch and hold a key photo and drag it to a new position.
Go to the Photos app Find group photos on iPhone