Ancient clan name, a branch of Baidi in the Spring and Autumn Period. It was initially distributed in the north of the Western Zhou Dynasty, that is, the area of northern Shaanxi and western Shanxi. In the spring and autumn, it moved to the northeast of Zhengding, Hebei. [1]
Zuo Zhuan · Twelve Years of Zhao Gong: "Jin Dynasty Xun Wu Those who pretended to meet with all the teachers, pretended to be in Xianyu, and entered Xiyang 。” 《 Mandarin · Zheng Language 》: "Wei, Yan, Zhai, Xianyu, Lu, Luo, Quan, Xu, Pu are in the north." Wei Zhao notes:“ Xianyu , whose surname is Ji in Zhai. " 
