If you and the other parent with parental responsibility want to change your child’s name you both have every right to do so. The simpliest way to do this is via a deed poll, which are able to prepae on your behalf. This is a legal document stating a change of name. It must be noted that if your child is over the age of 16, their consent is also required.
Once you have possession of this document, it would effectively override the name originally given to your child on their birth certificate. Whilst this is not obligatory, possession of this document would indicate your intention to change your child’s name, saving any unnecessary confusion later on.
If the other parent with parental responsibility does not consent to the change of name, the only option available is to apply to the Court for a Specific Issue Order.