A relative of mine works for a family law judge and researched the State of CA bylaws for you, I hope this answers your questions:)
NOTE: When a Petition for Change of Name has been filed for a child and the other parent, if living, does not join in consenting to the name change, the petitioner must have a notice of the time and place of the hearing or a copy of the Order to Show Cause served on the other parent not less than 30 days prior to the hearing under Code of Civil
Procedure section 413.10, 414.10, 415.10, or 415.40. If a petition to change the name of a child has been filed by a
guardian, the guardian must (1) provide notice of the hearing to any living parent of the child by personal service at least 30 days before the hearing, or (2) if either or both parents are deceased or cannot be located, serve notice of the hearing on the child's grandparents, if living, not less than 30 days before the hearing under Code of Civil Procedure section 413.10, 414.10, 415.10, or 415.40. (This Note is included for the information of the petitioner and shall not be included in the Order to Show Cause published in the newspaper.)
Cost is $320.00 or you may qualify for a fee waiver, here are the requirements :
http://www.courtinfo.ca.gov/forms/fillable/fw001info.pdf