The petition must be filled out and signed in front of a Notary Public. You may need additional forms to change a child's name.Incorrect or missing printed or typed name of individual or entity near the signature (GC 27280.5) should state: . Petition for a Name Change: This form must be signed and notarized. 4. Services include witnessing the signing of important documents, taking affidavits and depositions and giving oaths. Double-check all the information you have written in the certificate, such as the spelling of the signer's name and the date, and make sure it's correct. Complete the Department of State Change of Name form. Please provide proof of name change (i.e. Enter the affiant name. (the person swearing to the affidavit).