evidence: If an AAP is executed by the father, the registrant has the option to adopt the surname of the father as his/her surname. To do so, the mother/registrant, depending on registrant’s age, shall execute the Affidavit to Use the Surname of the Father (AUSF). The mother’s surname subsequently becomes registrant’s middle name, similar to the format of legitimate children. [...] 2. IS IT MANDATORY FOR THE WIFE TO ADOPT HER HUSBAND’S SURNAME AFTER THE REPORT OF MARRIAGE IS COMPLETED? [...] Option 1: Retain complete maiden name.