California Code, Code of Civil Procedure - CCP § 751.51

(a) An action authorized by this chapter may be commenced by:

(b) In an action authorized by this chapter every entity in actual and peaceable possession of, or having an estate or interest in or lien upon any of the land affected by the action, whose possession or evidence of estate or interest is either recorded or known to the plaintiffs, the city, if the land is within a city, the county in which the land is located, and the State of California must be designated in the complaint of the action, and given notice in the manner required by this chapter.

(c) All unknown entities, including owners, lien or interest claimants, heirs, devisees, legatees or assigns, may be described in the caption and complaint as “all entities claiming any interest in or lien upon, the real property herein described or any part of it.”