Set Your Preferred Name and Photo for Messages in iOS 13
In your list of conversations in Messages, you probably have lots of people who have generic icons next to their names or numbers. You likely look like that to other people as well, but a new feature in iOS 13 lets you share your preferred name and avatar picture with other iMessage users (blue-bubble friends). In Messages, first tap the ••• button and then Edit Name and Photo. Then, in the activity view that appears, tap Edit under your photo to select a new photo and set your name as...