Where to begin. First of all, she gave up her father's name to take your name. She never had a name of her own. Because even now women are still treated like one man's property to be passed off to another man.

Next, once she married you that's who she became. She earned that name so it's now hers too. If you had had children and she got custody, would you expect your children to give up the last name as well? Of course not and both are equally ridiculous.

Did you discuss it before you showed up before the judge? Do you know here reasonings behind keeping it? I know a lot of women do because it's WORK. You change everything - driver's license, various insurance policies, bank accounts, payroll forms, HR forms, social security cards, etc. from surname to married name only to have to do it all over again in reverse? Aw hell naw.