Enforcement Rules of the Name Act Article 14

Before the May 20, 2015 amendments to the Act took effect and were promulgated, if a person applied for a surname alteration, adoption of spouse’s surname, restoration to original surname, alteration of given or full name, correction of real/legal name, resumption of traditional Indigenous full name, or resumption of Chinese full name, and no changes (corrections) were made to the names of the person’s spouse or child(ren), the household registration office shall, in accordance with its authority, update the household registration records of the person’s spouse and child(ren).After the household registration office updates said household registration records in accordance with its authority, it shall notify the person’s spouse and child(ren), if any, and request that they apply for a replacement of their National ID Card and Household Certificate simultaneously.
中文原文 姓名條例施行細則第14條
本條例一百零四年五月二十日修正公布施行前,有本人申請改姓、冠姓、回復本姓、改名、更改姓名、更正本名、回復傳統姓名、回復原有漢人姓名,其配偶、子女戶籍資料未為配偶、父或母姓名更改(正)者,戶政事務所應依職權為之。
戶政事務所依前項規定為職權登記後,應通知其配偶及子女,並請其換領國民身分證及戶口名簿。

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