California Code, Public Resources Code - PRC § 5512.5

(a) Except as provided in Section 5506.6, the question whether the district shall be named a regional park district, regional park and open-space district, or regional open-space district shall be considered at the hearing conducted by the board of supervisors of the county having the largest area within the proposed district.  At the conclusion of such hearing, the board of supervisors shall pass a resolution naming the district.

(b) Except as provided in Section 5506.6, after formation of a district, the directors may change the name of the district, at the conclusion of a hearing held for that purpose, by resolution approved by four-fifths of the directors of the district.  Notice of the hearing, specifying the time and place, shall be published at least once in a newspaper of general circulation in the district;  or if there be none, in the county having the largest population within the district.