Commandery
Xiapi 下邳Ancestral Commandery
The Yu Clan of Xiapi: Founded by You Yu
Main line: descended from the Ji surname. You Yu, a man of Jin in the Spring and Autumn period; his descendants took Yu as their surname.
Multiple origins: surname changes by ethnic minorities merged in.
Root point: Shaanxi.
▸ Domestic migration: rose in the northwest; crossed south in the Wei–Jin era; entered Jiangxi, Fujian and Guangdong in the Tang and Song, where the Hakka Yu flourished.
▸ Overseas branch: the Hakka and Chaoshan Yu went to Nanyang.