In general, Texas has very few official legal forms. This is why you will not always find a free fill-in-the-blank form for your situation.All Texas residents can apply for a name change under Texas Family Code Chapter 45. How to file for a name change in Texas if you are 18 years or older and want to legally change your name. Last Updated on January 6, 2023. Can I amend an assumed name certificate to change incorrect information? The Civil Filing Main Line phone number is . The Petition to Change the Name of an Adult included a legible and complete copy of the Petitioner's fingerprints. n. There is a specific kind of affidavit you need to complete and sign before a notary public to support your application for a change of name. Legally changing your name in Texas requires several steps involving documentation and a visit to the courthouse.