What's in a Name?

I came across this cross in our local churchyard. I was interested in the Christian name, Arthurina. When I did some research, it was listed as the female version of Arthur. This got me thinking. Was she referred to as Arthur for short? I thought this was pretty unique, but as I started writing this, I thought of Fredericka which must be the female version of Frederick. I guess there must be others, but I can't think of any. Does anyone know of other examples of cross-naming?