File your forms in the Circuit Clerk's office. Your Request for Name Change (Adult) has to be notarized prior to filing.Please fill out this form completely and return to our office at the address indicated above. Go to the courthouse and fill out a form, showing your current name and the name you want, plus your reason for changing it. 8. This form must be signed in the presence of a notary public. Notary publics are available at most banks and currency exchanges for a minimal fee. You go to the courthouse and fill out a form, showing your current name and the name you want, plus your reason for changing it. In Cook County, these forms may be located on the clerk's website. 2. 1. Print out a copy of the Illinois Affidavit and Certificate of Correction Request form. 2.