Name Act Article 10

A person who meets one of the following requirements may apply to change his/her surname and given name:1. The applicant’s current name has an excessively long or incorrect Romanized form;2. The applicant has joined or departed from a religious order; or3. The duties of the applicant as a government employee require a name change.
中文原文 姓名條例第10條
有下列情事之一者,得申請更改姓名:
一、原名譯音過長或不正確。
二、因宗教因素出世或還俗。
三、因執行公務之必要,應更改姓名。

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