Is it usable?
I don't think so, at least not for me. Too fairytale sounding. It reminds me of
Cinderella, etc.
Do you like it?
I like the sound of it and it's good for a story but that's it really.
Nicknames (they're inevitable) that you prefer?
Dru is the most obvious and nicest to me. I like
Drew as a name, on its own.
I have never heard of
Caligula. :)