My suggestion is any or none or some other theme. They all sound good to me. I like the idea of a theme.

How about some cartoon characters they resemble. Or the characters in a favorite book?

Mr. Spunky got his name because I was calling him Punk. He was WILD when young, but Punk sounded so negative.

Sam was originally called Red because I was going through my "who am I to name a cat?" phase. His full name is Samwise Rory Beauregard Gamgee the Red because I couldn't decide what name to finally give him months later.

Jane is Lady Jane Grey, because she looks re-markedly like a Russian Blue and it was the first name to come to mind., She answers to Little Girl also.

Emily was originally "Fat Lady" (the previous owner) and for some reason Emily kept coming to mind.

Bob was originally Little Man (again previous owner) and I named him Bob because he has a knobby tail and he appears to be a real Bob-tail.