Surname Overview
Clans and States Associated with the Si Surname
The Si surname intermarried with the Ji and Jiang surnames for a long period; the Si, Youjiao, Youchong (Gun), Xiahou, Youshen, and Qi groups, as well as Ta Si and Bao Si, are all identified as belonging to the Si surname.
Reference: 姒姓_百度百科
Origins
Origin Tradition of the Yu Line
One tradition says that Yu was born after his mother swallowed coix seeds, and that Shun ordered Yu to inherit the ancestral surname of the Youjiao group. Another view holds that Si was Boy Gun’s surname, that Yao bestowed the Si surname on Gun, that Yu was his son, and that the Qi state in the Spring and Autumn period was a descendant state of the Si surname.
Reference: 姒姓_百度百科
A Line Descending from Shaohao
One tradition says that Tai Dai, son of Shaohao, was enfeoffed in the various Fen River valleys, after which the states of Shen, Si, Ru, and Huang arose; the surname Si was taken from the state name. Ta Si, wife of King Wen of Zhou, came from the state of Si.
Reference: 姒姓_百度百科
Historical Records
Record of Yao Bestowing the Si Surname
The Wu Yue Chunqiu records that Yao designated Yu as Boyu, appointed him Sikong, bestowed on him the Si surname, and assigned him to lead the regional chiefs in touring the twelve divisions.
Reference: 姒姓_百度百科