i had a child out of wedlock almost four years ago. her bio father is not on the birth certificate, and has never tried to make contact with us. he lived down the street for a little while. i was 15 and he was 21 when we first got together. after six months of pregnancy he did not give up smoking weed or cheating. we split and have not spoken since. i am getting married in oct, my daughter and i share the same last maiden name. i want to no if i can change her last name along with mine with out a whole lot of problems? please help i am young and need advice on what to do about the situation.