Quote Quoting Chas16
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My question involves name change laws in the State of: My concern is I let my daughter have her bio-fathers last name now I'm six months pregnant with his other child and I want the new baby to have my maiden but before I think about giving him mine I didn't think it would be right with them being full brother and sister having two different last names. If I change her name even with a child support case open because he's not willing to help as a father on his end and he's basically legitimized would that stop the child support case and what problems would it MIGHT bring? ��
You cannot change her last name without either his permission or the permission of the courts, and the courts are not likely to give permission if he objects. He can also fight you on the last name of the new baby...and he would have at least a 50/50 shot of winning that case.

All in all, it might be more sensible to give the new baby the same last name as his sister.