Which name for their sibling [choose one boy and one girl name WARNING UNUSUAL names]?

I love Fallon, but prefer it for a boy. I like Asa. I like Espie for a girl, but not as short for Gillespie. Just by itself. "Regulus" sounds like an American Gladiator. If I named a child Carlisle, I'd probably call him Lyle for short. I don't care for the remainder.