The name on your ticket and your passport or other official government documents must match, according to airline policy. Furthermore, you might not be allowed to board your plane if they don't match. As a result, you will have to start the ticket's name change or update procedure. See the airline's official website or give them a call at the customer service number for further information on the "American Airlines name change policy." If they are not available, you can get help by giving the consolidation desk a call at +1-800-633-0441.