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.Petitioner must be 19 years of age or older and must be a resident of Montgomery County to file a petition for a name change. Steps to be appointed a notary public. Download Notary Application. File your form and attachments in the same county where you live. I declare that the following information is true: q My current name is: first middle. Fill in the minor's name at birth, date of birth and place of birth. 3. Fill in the present name and requested name of the minor. After the Affidavit of Service is done, it must be filed with the Court.