Enforcement Rules of the Name Act Article 5

Where the legal name of a citizen of the R.O.C. or the Chinese name of a foreign national or stateless person does not use Chinese characters found in the Ciyuan Chinese etymological dictionary, the Cihai Chinese encyclopedic dictionary, the Kangxi Dictionary, or the Guoyu Cidian compiled by the Ministry of Education, or such Chinese characters found in the Dictionary of Chinese Character Variants compiled by the Ministry of Education, as specified in the Act, then the party concerned may apply for corrections to commonly used characters or traditional Chinese characters found in the aforementioned dictionaries.
中文原文 姓名條例施行細則第5條
國民之本名或外國人、無國籍人之中文姓名未使用本條例規定辭源、辭海、康熙等通用字典或教育部編訂之國語辭典中所列有之文字,或該文字屬教育部異體字字典所列之異體字,當事人得申請更正為上述字(辭)典所列通用文字、正體字。

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