In order to change your child’s name, the judge must find that changing your child's name is in the best interest of your child.
If you are involved in a family law case like parentage, child support, or child custody, and there hasn't been a final judgment [1] yet, you can ask that the name be changed as part of the family law case and you may not need to file a civil name change case. If you are not sure what type of case you should file, you should obtain legal advice from an attorney.