Cal. Bus. & Prof. Code § 5610.3

The name of a professional architectural corporation and any name or names under which it may be rendering professional services shall contain and be restricted to the name or the last name of one or more of the present, prospective, or former shareholders, or of persons who were associated with a predecessor person, partnership, or other organization and whose name or names appeared in the name of the predecessor organization, and shall include either (1) the words “architectural corporation” or (2) the word “architect” or “architects” and wording or abbreviations denoting corporate existence.