RSA 5-C:89 Documentary Evidence Required to Amend Birth Record.

I. Other than corrections in spelling, clerical errors, or omissions, name changes involving the name of the registrant, or the names of his or her parents as listed on a birth record, shall require a certified copy of a court order that states the name to be changed and how the name is to appear on the birth record.
II. Within 6 months of the filing of the birth registration, a request to change the spelling or to add the name of a child shall be processed by the clerk of the town or city. The form used to make the request shall be signed by the parent as recorded on the birth record, the guardian, or the legal representative of the registrant and shall be an acceptable affidavit for such a name change. The record shall be noted with the first name, middle name, or last name,