The Indigenous Peoples Basic Law Article 11

The government shall restore the traditional names of indigenous tribes, rivers and mountains in indigenous peoples’ regions in accordance with the will of indigenous peoples.
中文原文 原住民族基本法第11條
政府於原住民族地區,應依原住民族意願,回復原住民族部落及山川傳統名稱。

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