Commandery
Gaoyang 高阳Ancestral Commandery
The Xu Clan of Gaoyang: A Distinguished Nanyang Family
Main line: descended from the Jiang surname, through the Four Sacred Peaks of antiquity. Enfeoffed with the State of Xu in the Zhou dynasty (Xuchang, Henan); when the state fell, descendants took the state name as their surname.
Multiple origins: surname changes by ethnic minorities merged in.
Root point: the ancient State of Xu in Xuchang, Henan.
▸ Domestic migration: originated in the Central Plains; crossed south in the Wei–Jin era; entered Fujian in the Tang and Song, where the Xu of Quanzhou and Zhangzhou grew into a great clan; later spread into eastern Guangdong.
▸ Overseas branch: in the Ming and Qing, the Xu of Quanzhou and Zhangzhou formed the main force going to Nanyang.