I've suddenly really begun to like this name. It's not something that I'd normally go for, but after reading a book in which a set of twins were named Selene and Helios I've really dug it. (I love Helios as well, but I'll probably save it for a cat)
WDYT? For some reason it seems to me to be less substantial than my other favorites - Judith & Miriam - so I'm hesitant to use it. Still I really do like it.