California Code, Code of Civil Procedure - CCP § 1277.5

(a)(1) If a proceeding for a change of name to conform the petitioner's name to the petitioner's gender identity is commenced by the filing of a petition, the court shall thereupon make an order reciting the filing of the petition, the name of the person by whom it is filed, and the name proposed. The order shall direct all persons interested in the matter to make known any objection to the change of name by filing a written objection, which includes any reasons for the objection, within six weeks of the making of the order, and shall state that if no objection showing good cause to oppose the name change is timely filed, the court shall, without hearing, enter the order that the change of name is granted.

(2) If a petition is filed to change the name of a minor to conform to gender identity that does not include the signatures of both living parents, the petition and the order to show cause made in accordance with paragraph (1) shall be served on the parent who did not sign the petition, pursuant to Section 413.10, 414.10, 415.10, or 415.40, within 30 days from the date on which the order is made by the court. If service cannot reasonably be accomplished pursuant to Section 415.10 or 415.40, the court may order that service be accomplished in a manner that the court determines is reasonably calculated to give actual notice to the parent who did not sign the petition.