Illinois Adult Change of Name Instructions provide guidance on how to legally change an adult's name in the state of Illinois. The process involves filing a Petition for Name Change in the appropriate court, paying the associated fees, and appearing for a hearing. Depending on the county, the process may also involve publication of the Petition in the local newspaper. The types of Illinois Adult Change of Name Instructions include Forms to Petition for Change of Name of an Adult, Petitioner’s Affidavit of Service, and Order Changing Name of an Adult.