My ex wife started using my last name after our divorce was granted. She never legally changed her name during the marriage. The name was not awarded to her in the divorce decree. I have all of our tax return info which had to be submitted with her maiden name in order to be processed. Our court paperwork was filed in her maiden name. And she didn't decide to start using my last name until a month after the judge awarded the divorce. She only uses the name when applying for anything involving credit, Rent applications, new utility bills, and so on. We were divorced in Texas, and I was awarded custody of my son with no geographical restrictions and have since moved back to Il. Is there anything that can be done about this?