All my family has my middle name as their last name
Assuming that you are over the age of 18 years and a California resident, there is a Name Change Petition that you can file in the Superior Court of the county where you live. You can get all the necessary forms online or from the court clerk, The forms come with detailed instructions for use by non-lawyers. You will also need to publish a notice in a local newspaper.
Under the Family Code, the court can give you a former name or maiden name upon divorce or even afterwards on an ex parte request. But you want to change your name. You will have to filed a Petitioner under the Civil Code of Procedure. Look at CCP 1275 and further.
Try this link: http://www.scscourt.org/self_help/probate/namechange/namechange.shtml
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