Washington Petition For Adult Name Change is a legal process that allows adults to change their name in the state of Washington. It is a two-step process which begins with filing a petition for change of name with the Superior Court in the county in which the petitioner resides. Once the petition is approved by the court, a court order is issued allowing the name change. There are two types of Washington Petition For Adult Name Change: Simplified Name Change and Regular Name Change. The Simplified Name Change requires the petitioner to submit an affidavit, a form to change the name, and a filing fee. The Regular Name Change requires a petition, a hearing and a court order. Both types of name change require the petitioner to publish a notice of the name change in a local newspaper.