Form 21.01 - Affidavit in Support of Application for Change of Name of Adult (MUST be notarized PRIOR to filing at Court. Complete all fields on the Application for Change of Name of Adult (Form 21.0), the Birth Certificate.The applicant must sign the Application for. Change of Name, which includes a statement that the applicant has lived in the county for at least one year. You can use this form to request a legal name change in Cuyahoga County Probate Court. Learn more about changing your name in Ohio. This form can be used to file an affidavit in support of court papers in the Cuyahoga County Domestic Relations Court. Completed Application for Change of Name. Take the original and the 2 copies to the Probate Court Clerk in the County in which you have been residing for the last year. Take your Poverty Affidavit too.