My son and his girlfriend just had a baby. They are not married, not sure if they will in the future. On the birth certificate, the last name given to the baby was my son's last name hyphenated with then the mother's last name. I thought it should have been mother's last name hyphenated with father's last name.

And why do you think that? Does it really make a difference?

Generally its father's name first.

And why do you think that? Does it really make a difference?

Thank you for your response. I just wasn't sure.