Name Changes are filed in District Court, in the county where you reside. Generally a Petition for Name Change and an Order for Name Change must be completed.You should be able to request a name change petition form from the county jail in which you are being held. You can file an application to change your legal name in any district court in Washington. The person requesting a name change is called the "petitioner." Filing a Name Change Petition. As part of the filing fee you will be provide three certified copies of the name change order. When completing a deed it is required that the form contain a Legal Description of the property. Fill in the deed form. The first formal step in changing your name is to file a Petition for Change of Name in the Superior Court of the county where you reside.