The name change petition can be filed in the County Court or Supreme Court of the county where you live. The easiest way to change a name or sex designation is to make the court papers you need using the DIY (DoItYourself) Form program.To file for a name change in New York, the individual seeking a name change must have lived in New York for at least six (6) months and be a current resident. The user of this affidavit agrees to hold the Department harmless for any and all claims which may arise as a result of completing this affidavit. New York Name Change Laws. To obtain a legal name change in New York, an applicant must submit a petition to the court. Instructions: Use this form to report a change in your name. Read these instructions carefully and complete all applicable sections of this form. You'll need to go to a local court and file a petition to assume another name. This will require the payment of a filing fee.