I catched the movie "GO" on TV and one of the main characters is called Ronna.It got me thinking, and kinda liking it too, if it is a nn for Veronica.TIA!
I knew a Ronna who was actually Ronalda, a Donna who was actually Donalda, and a Ronnie who was actually Veronica. But there isn't a rule about it; I've also known a Veronica who went by Vera.