Catherine, and variants of it, was my top name for years and years. It fell a few years ago, but I've suddenly taken a liking to it. It would be the name of my SIL, but I'm still tempted to use it. I would most likely call her
Kay, I think.
Wdyt? I was thinking about
Katharine May or
Catharine May, though I would probably use the second spelling. I'm also thinking about variants, such as Catria.