Washington Petition For Change of Name is a legal document used to legally change one's name in the state of Washington. It must be filed with the superior court in the county where the petitioner (person requesting the name change) resides. The petition must include the petitioner's name and address, the proposed new name, the petitioner's date of birth, the reason for the name change, and the petitioner's signature. The petitioner must also include a copy of their driver's license or state-issued ID, as well as proof of their residency. If the petitioner is a minor, the petition must include the signatures of both parents or guardians. There are three types of Washington Petition For Change of Name: Adult Name Change, Minor Name Change, and Gender Change Name Petition. An Adult Name Change petition is used when the petitioner is an adult (18 years of age or older). A Minor Name Change petition is used when the petitioner is a minor (under 18 years of age). A Gender Change Name Petition is used when the petitioner is requesting a change to their gender identity.