The name change petition can be filed in the County Court or Supreme Court of the county where you live. 1. Index Number Application: This form must be filled out and signed in order to obtain an index number from the County Clerk's office.The forms for changing a name or sex designation in the Supreme Court or New York City Civil Court are included in the chart below. Packets of forms are available for sale to be used in filing a new case or modifying a case in either the Family or Civil courts. My father's name is the same in all my documents but different than what's written on his documents. Will this cause any problem to me? 1 Index Number Application This form must be filled out and signed in order to obtain an index number from the County Clerk's office. My name and my stepson name is on an Affidavit of Descent. How can I have my name removed from this document? Free forms are available for those actions that only require the single form to be filed on an existing case.