In general, Texas has very few official legal forms. What is the fee to file an Assumed Business Name?All Texas residents can apply for a name change under Texas Family Code Chapter 45. 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. How to change your name and gender marker in Texas, with steps to update documents. (Personalized Seal). The Civil Filing Main Line phone number is (210) 335-2621. I am employed as an Escrow Officer of the Title Company that closed the transaction relating to the Original. Information of Person Signing Affidavit: Enter your first, middle (if any), and last name. If it does not, you may need to file a One and the Same Affidavit explaining why the names are different.