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.There are 2 kinds of name change court processes in Washington. Each type of name change has its own forms, requirements and speci ic court you will use. 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." When completing a deed it is required that the form contain a Legal Description of the property. Filing a Name Change Petition. Fill in the deed form. Request a Petition for Name Change from the division of the District Court closest to your residence.