is this name stealing or not?

I LOVE the name Athena and my good friends step daughter (who is 4) already has that name, is it wrong to use it ? It has meaning to me because I am Greek and my family actually loves it too, I am absolutely stumped over this. Noone owns a name and I'd hate for us to not be that close in the future and not have just used it. What should I do? Any other name ideas?? Bahh