Thoughts on:
Rhonda, Ronda
Ronnie
Veronica
Ron
Ronald
They are not on my list at the moment but I watched a movie with a little girl called Rhonda in it and I thought it sounded very cute on her. It could also be spelt Ronda.
Ronnie seems to be rising like crazy for boys but I personally think it's cute as a nickname for a girl, for Rhonda or Veronica or something else.
Ronald is one I could see coming back as well with there being a Ron in Harry Potter.