I use to get in a huff over names but it really doesn't bother me now. They might have had that name picked out for sometime, maybe before you even named your child, or maybe it holds some special meaning for them.

People will more than likely at some point in their lives run into someone with the same name, or something pretty similar.

I don't think it takes anything away from your DD's name.

IMHO I think we spend too much time stressing over names. It's great you want your child to have a unique name but at what cost? What lengths are you willing to go to? And really, so what if someone has the same name, it is just a name. It wont define who they are.