Well, I think when you get into singsongy pet name kinds of nicknames, any name can have them. In that case,
Iris could be I or Irie or Rissy,
Mara could be Mar or Marri (rhyming with
Ari), and
Audrey could be Audy or Rere or something. But, like Noey and Ezzie, they're not nicknames that are used as the primary way a person is addressed. I think there's a distinction there.