Use the packet titled How to Ask the Court to Change a Name in the Chancery Division, Family Part. Instructions: Use this form to report a change in your name.Read these instructions carefully and complete all applicable sections of this form. Give the form to your local notary office and have them legally complete your affidavit of change name. The name change petition can be filed in the County Court or Supreme Court of the county where you live. How do I file a change of name for an adult? The Middlesex County Clerk's Office stands ready to assist with recordation of real property ownership and transfer, and in retrieval of information. You must file the Affidavit in cases involving the care, custody, visitation, or change of name of a child.