The name change petition can be filed in the County Court or Supreme Court of the county where you live. To change your legal name or to correct an error in your legal name, complete a name change request (AccessID and password required).File the completed petition and fingerprint card in the Prothonotary's Office located on the 2nd Floor of the. Courthouse and pay the applicable filing fee. You must fill out the forms and bring them to the courthouse. Complete the card entirely. i. Name Conformity: Click here for forms relating to an action for name conformity. 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. CHECKLIST. ☐ Fill out the Petition to Change Name (of an Adult).