The petition must be filled out and signed in front of a Notary Public. Fill out and complete the PDF to order a copy of a Business Certificate.The easiest way to change a name or sex designation is to make the court papers you need using the DIY (DoItYourself) Form program. FKA (formerly-known-as) is only allowed with a marriage, a divorce, or a legal name change decree attached. Update. To update your personal name, business or residence address download, complete and submit the Change Notice to the address on the form. For this form you'll put your full legal DEADNAME (including middle) in the Plaintiff field. You go to the courthouse and fill out a form, showing your current name and the name you want, plus your reason for changing it. Suffolk County does not notarize the form. You may consult your attorney before completing. Disclosure Affidavit.