I love
Petra, mainly because
Petra,
Jordan was the most incredible place I've ever been and it conjures up some great memories for me. But, I don't think I could ever use it. I know it is a girls name, but
Petra (the place) was so massive and grand that it came across as very masculine to me. And while the name itself sounds feminine, I can't get the masculine association out of my head long enough to picture it on a girl, at all. I don't think it would work on a boy, though, so I doubt I will ever use it.
But I have to agree, it would be an incredibly awesome name to have.