I believe that Ms. Roberts-Ross has answered your question well, however I just wanted to be sure that your question pertained only as to including your boyfriend's last name as part of your baby's name, and not also regarding listing your boyfriend on the birth certificate as the father. If you are having questions about listing your boyfriend as the father on the birth certificate, that raises a variety of other issues and could have many consequences going forward - which you would want...
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It would likely be helpful for you to contact the local office of the Department of Child Support Services because they can assist with enforcing child support orders. You can find out more about their services online here: http://www.childsup.ca.gov/Resources/ApplyForServices.aspx Also, because you stated that you are not able to hire an attorney for this matter, you may want to seek assistance from your county's Family Law Facilitator so they can try to guide you; although you would still...