Name Act Article 13

To change a surname, take the spouse’s surname, restore one’s original surname, change a given or full name, or correct a legal name under the provisions of this Act, the applicant should be the concerned party or his/her legal representative. To change a surname due to an adoption or termination thereof, the person initiating the adoption or termination thereof may serve as the applicant.
中文原文 姓名條例第13條
依本條例規定申請改姓、冠姓、回復本姓、改名、更改姓名、更正本名者,以本人或法定代理人為申請人。
因收養或終止收養而須改姓者,辦理收養或終止收養登記之申請人,均得為改姓申請人。

English translation for reference only; the Chinese text prevails. Not legal advice.