Yes, you can use an affidavit to prove a name mismatch. Go to the courthouse and fill out a form, showing your current name and the name you want, plus your reason for changing it.Learn how to use and draft affidavit forms with this comprehensive guide. An Affidavit for One and the Same Person is a written statement where someone swears that two or more names actually refer to the same person. Formatting an Affidavit ; Step 1: Decide what the title of your affidavit will be. All Texas residents can apply for a name change under Texas Family Code Chapter 45. Residency is rarely challenged at the time a person registers to vote. The facts contained in the foregoing Affidavit are true. If it does not, you may need to file a One and the Same Affidavit explaining why the names are different. Information about legally changing one's name in the state of Texas.