PDFWAC 314-55-130
Change of business name.
(1) If a licensee wishes to change the name of their business, the licensee must apply for a change of trade name with the department of revenue, business license service.
(2) If a licensee wishes to change their corporation or limited liability company name, the licensee must apply for a change of name through the secretary of state.
(3) See chapter 434-12 WAC for guidelines for trade names.