File your forms in the Circuit Clerk's office. Your Request for Name Change (Adult) has to be notarized prior to filing.Create and download forms for. Download and complete the Name Change forms from the Illinois Office of the Courts. The following are basic rules for proper and safe notarization: 1) Keep your notary seal in a safe place; 2) Do not notarize a signature unless the signer. "affidavit" swearing to they know you and know you plan to change your name. a. A completed and notarized State of Illinois Affidavit and Certificate of Correction Request. A certified copy of the Order for Name Change. Do you live in Illinois and need to prepare an affidavit? Read more about the basics of using a general affidavit form in Illinois.