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. The name change petition can be filed in the County Court or Supreme Court of the county where you live.A name change affidavit typically includes your current legal name, the new name you wish to adopt, and the reasons for your name change. Another person, preferably a blood-relative, who has personal knowledge of you using both your legal name and your chosen name, will fill out this Affidavit. Intheblanks form required for any matter originating and electronically filed in Supreme or Surrogate's Courts in Richmond County. Affidavits must also: • include all relevant facts. • be written in the first person using an active voice. The child's surname can be changed with this same form.