When couples marry in California, the bride simply signs a marriage certificate to take her husband's surname. The other way around? Not so easy. Under legislation approved Monday, men would be granted the same rights to change their surnames as women. It would eliminate the often time-consuming and costly process of going to court to change a man's last name. The bill also would give men and women who register in a domestic partnership the same right. "It just allows for married and domestic partner couples to choose the last name of their choosing," said the bill's author, Democratic Assemblywoman Fiona Ma of San Francisco. Her bill passed the Assembly on a 42-20 vote and goes to the state Senate.