PDFWAC 314-07-090
Change of business name.
(1) If you wish to change the name of your business, you must apply for a change of trade name with the department of revenue, business license service.
(2) If you wish to amend your corporation or limited liability company name, you must apply for a change of name through the secretary of state.
(3) See chapter 434-12 WAC for guidelines for trade names.