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.File your forms in the Circuit Clerk's office. Your Request for Name Change (Adult) has to be notarized prior to filing. A completed and notarized State of Illinois Affidavit and Certificate of Correction Request. A certified copy of the Order for Name Change. This affidavit must be notarized. To obtain a legal name change in Illinois, an applicant who has resided in the state for at least six months must submit a petition to the court. 1. Print out a copy of the Illinois Affidavit and Certificate of Correction Request form. 2. To obtain a legal name change in Illinois, an applicant who has resided in the state for at least six months must submit a petition to the court.