Two ideas. 1. Singing your name. Sing the whole sentence "my name is John Doe." or first say "my name" and then sing "is John Doe." 2. Text to speech with AAC. An AAC app usually already has "my name is" as a button, but you can also add a button for your name. So you can say "my name is" and then make a "wait for me" gesture and press the button for your name. If you think it might take a while to open your phone and open the right app and find the right button, you can repeat "my name is..." a few times in the meantime.