You can legally change your name back to your family name, or any other name, for that matter, as long as it is not for an improper purpose. The Court filing fee is $322. The process is pretty simple, but not instantaneous. You are duplicating the filing fee if you decide to get a divorce, as the name change is included as an option with the divorce. If he is shady, you may want to file as "married, filing separately," when you do your taxes. If he is taking money from a piggy bank, that is more than just a problem with a relationship that counseling can help. What a disappointment it must be to have him act poorly. But, lots os women don't rush into getting all of their IDs changed right away, so maybe you could try counseling and hold off switching to using "his" name until you decide if this is a marriage to save. If you want to talk to family lawyers in a no cost meeting, I know we would be happy to meet with you and at least help you know your options, and I am sure other family law lawyers would as well. Good luck.