The name change petition can be filed in the County Court or Supreme Court of the county where you live. 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.Complete and sign the appropriate birth certificate form. Enclose original documents to support the amendment. The applicant must have resided in the county for the past 60 days. A. You must complete form PC 51 or PC 51c to begin a name change proceeding. Use this form (PC 51) unless you have good cause not to publish. To have your address or name changed on a tax record, you must visit your local assessor's office within the municipality of where the home is located. The child's surname can be changed with this same form. Upon any change of ownership, a new and amended statement of registration must be filed with the Clerk of Superior Court.