Utah name change forms allow residents to legally change their name through the district court of the county in which they reside. This page explains how to ask to change a minor's name, legal sex (sometimes called a gender marker), or both.Most vital records may be amended. All amendments require an affidavit or court order. All signatures MUST be notarized. 3. General affidavit form for use within the State of Utah. Modify this affidavit to meet your specific needs. As a Notary, how do you stay impartial if the signer is your relative? The Petition for the state of Utah is easy to fill out. Affidavit of Name Change: Declares a person's intent to change their legal name.