From the anime
Made in Abyss: The Golden City of the Scorching Sun
曾 小牛
Zeng Xiaoniu is the son of the mortal Zeng Daniu and a friend of Wang Lin. After Wang Lin secretly improved his aptitude with elixirs, he was taken in as a disciple by the Baiyun Sect cultivators and given the name Zeng Wenzhuo.
Source: Baidu Baike, translated
