I'm not going with the feminine of my current name as I just... Really don't like it. I'm not keen on my birth name as it is (Sorry, mum).
So I went with Coraline, inspired partly by the book and film. It's not set in stone, though, but I can't see it changing at all. I love it too much. I chose Kathryn as my middle name (Again, not official yet) for a few reasons. Firstly, I love the name Katie and I also like Kath, but I didn't want Kathryn (Or Catherine) as my first name. Secondly, it's kinda sensible as my mum loves history, and her 'favourite' king to learn about is Henry VIII, who had three wives called Catherine, so it made sense in my head for it to be my middle name - It's a nod to my mum's passions.
I was going to ask for my mum's input when I come out, but I think a name is a personal thing if/when you transition or present as female, and having something I'm comfortable with has been sooo beneficial to me.