I especially love it as a middle name: PenelopeWren, ClaudiaWren. I can't decide whether or not it would work as a first name, though. Any thoughts would be welcome!
My aunt has a sister named Wren. It's a little bit dated but not too bad as a first name. Wren in the middle name slot give me more of the avian vibe, while Wren as a first name is a little more neutral.