
Quoting
LawResearcherMissy
As is her right. She was under no obligation to let ANYONE attend her doctor's appointments with her. Medical privacy is enshrined in law, and being the potential donor of half a fetus' genetic material is not enough to force violation of that.
She didn't have to. She still doesn't have to. She can name the baby Tallulah Does The Hula From Hawaii, and no one can do a thing about it.
A paternity test to legally establish paternity is necessary before he can even think about asking the court to change the child's name.
That's all he can do is ask, though. The court may say yes, it may say no.
Until he requests a paternity test to legally establish himself as the father, he has no right to see the child, and certainly no right to demand that it bear his last name. At this moment, and continuing until a paternity test shows him to be the biological father, he is a legal stranger to the child.