[Opinions] and before anybody asks ...
I don't think that most masculine nns are good on adult women. Sam, Charlie, Stevie, and Mike. Mke, you ask?
Yes, I once met a nurse who called herslelf Mike. I thought "What are you, ten years old and and disguising yourself as your brother to play on a Little League team in some 1970's kiddie movie?"
I'd include Nikki/Nicky, too, but I don't think this is a good name for ANYBODY except maybe a mobster. Little Nicky or Nicky the Knife.
We don't need to set the sky on fire. A little glow will do just fine.
Bob Ross