I think Moonbeam Rainbow has a lovely ring to it :-DDarth? Not so much. Rebel Leader, maybe, but not Darth.
I'm somewhat partial to Rainbow Unicorn.Yeo - the whole fascination with the dark side is a little bothersome, though if we did have a Darth, then there's a good chance the kid would have an awesome theme song.
You could go with "Darth Brooks," but then people would think you couldn't spell...which is worse?I LOVE Rainbow Unicorn!