Addison - Boy's Name or Girl's Name?

I just put together this comprehensive profile on the name Addison. It's a fairly detailed piece that doesn't just give you the meaning of the name, but provides an historical view of the usage of the name. Not to mention I throw in some fun stuff like middle name ideas, celebrity connections to the name, and other interesting facts.

But my question for you is this: do you consider this a boy's name or a girl's name? Or perhaps both?