Though gay marriage in Washington took effect in December following a voter-approved referendum, gay couples in the state may still face challenges when it comes to choosing surnames. Under current law, same-sex couples must file a petition if they wish to change their names after their wedding. A bill sponsored by Rep. Jim Moeller, D-Vancouver, would simplify the process of legally changing last names. Instead of filling out paperwork, couples would just need to show a marriage license and photo ID. The newlyweds could choose to adopt one of the spouse’s surname or a combination of both last names.