If you're in the US, you'd have to petition the court for a legal name change. They would contact Dad and give him the opportunity to contest it. Even if he doesn't contest it, if he pays child support (rather he sees the child or not), there's a fair chance they will deny your request.
it hasnt
it hasnt
it hasnt
it hasnt
it hasnt changed really
It Hasnt
it really hasnt
it hasnt
It hasnt. uKink?
It hasnt, its still as bad as before.
Lol it hasnt...
a lot