If its a huge deal, pick another one.
She had a boy first so she got first pick.
If its a legit name, well then you don't own it.
What is the name? I'm very curious now. Are there any names that are similar but not exactly the same?
That really blows though. I guess for me it would depend on how often we hang out and if I see our friendship lasting a while. I would probably be inclined to change my baby name.