lol did you just watch the new episode of Doctor Who? I don't think the TARDIS is necessarily female :P
Anyway, I like it. I'm American though, so aside from Idris Elba, the name is entirely unfamiliar to me and I don't associate it strongly with either gender. I think it sounds like a unisex name imo - it has both a masculine and feminine sound. So when I was watching Doctor Who and house called the TARDIS Idris, I wasn't all, "but that's a girl's name!"
I'm not sure how it would be taken in the UK... it'd probably seem weirder there, especially in Wales, seeing how Idris Elba is much more well known over there?