Whenever a person born in this state has his or her name changed by order of a court of this state, another state, the District of Columbia, or any territory of the United States, an application including an affidavit of this fact may be filed with the office of the State Registrar upon a form provided for that purpose.
Source:
Section 103400, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=103400..