Article 22 of China's Marriage Law stipulates that children can take their father's surname or their mother's surname. Generally speaking, after a child is born, his/her name is determined by both parents through consultation, so the change of the child's name should also be agreed by both parents through consultation.
The police station wants you to go to the notary office for notarization because you are responsible for you and them. If one party disagrees and the other party forcibly handles it, the account will bear legal responsibility, and the other party has the right to sue the renamed party and the account registration agency.
I hope my answer will satisfy you. Thank you for your adoption!