My 16-year-old is an aspiring entertainer (theater, dancing, etc). He wants to change his last name given at birth to reflect my married name of the past 6 years (his stepfather's name). Can we accomplish this through a DBA? If so, can he use it in school? We already have his official school documents/registration established with his birth name (which is on his birth certificate). He would prefer to be addressed by the trade name he wants to establish. Thank you.