legally, no.
Fathers with parental rights are not always listed on the birth certificate.
The mother should put the actual fathers name on the birth certificate.
See Link BelowChild Custody- Can Fathers Win
It all depends upon marital status (implying you are,) if birth is after marriage, then normally like the wife the child takes the fathers name,if pre-marriage then the child when they are older may choose the surname they prefer
First, paternity must be established, either by acknowledgment or genetic testing (DNA).
Yes. Go to a lawyer. He/She will discuss it more further.
Single fathers have no rights
This should be part of your will.
Since you were adopted by another man at age 6 and now go by his surname I don't think you can be considered you biological fathers child in the eyes of the law now. Your biological fathers name is not on your birth certificate. You could try and see if social security would except a DNA sample from your biological fathers other children to prove that you are his child or maybe your biological fathers parents(this would be better) if any of them would do that for you.
You haven't explained whose birth certificate. If it's her biological child then she must sign the birth certificate. The biological parents of the child sign the birth certificate.
My daughter has my last name, her dad isn't on the birth certificate but he does pay child support. can i change her last name when i get married and how? My daughter has my last name, her dad isn't on the birth certificate but he does pay child support. can i change her last name when i get married and how?
DNA testing can be done before or after a birth certificate is signed if there is any question about who the father of a child is or if visitation rights are being contested.