Adding my stepfather's name

How do I legally add my stepfather's surname onto my surname and do I need my birth father's permission. I am aged 13 years

Your name would have to be legally changed. What State? Do you have the permisison of your birth father?

You will need an Attorney.

Here is good info: "Through court order, a name change is possible whether or not there has been a remarriage. In divorce, a woman can request to return to her maiden name as part of the proceedings. If she wishes to change her children's name to her maiden name as well, she can make a separate petition to the courts. The factors that the court will consider in deciding whether or not to grant such a petition vary from state to state, but generally involve considering the impact such a change will have on the child and what the other parent's relationship with the child is like.


Be aware that changing the last name of a minor child does not change the identity or obligations of the child's father. Changing a child's last name to match a stepfather's does not absolve the natural father from paying child support, nor will it obligate the stepfather to pay child support should his marriage to the mother end in divorce. By contrast, legal stepparent adoption does change the legal identity of the father; the stepfather becomes the legal father, and will be obligated to pay child support if the marriage dissolves. Be aware as well that if your child is an adolescent, the courts will likely require the child's written consent to any proposed name change."

http://www.essortment.com/lifestyle/changeminorchi_skyf.htm