Yu ji, as the offspring of king wu of zhou ji fa, to China's.According to the new tang book · prime minister genealogy table ", ji fa g business, big packet, the second son Yu uncle sealed in Yu countries, namely QinYang county of henan province north west wan town Yu Tai village, later, the sons of Yu uncle for the surname, some surname Yu;Others to name in the city, is for henan's, said yu authentic history.According to the history of road, the east China sea (roughly in the southeast of shandong and jiangsu east of north jiangsu area today) used in public sun, this as the han Chinese, with Rio tinto stating pull migration to the generation of north (roughly the present FanShi dai county, shanxi, five sets, the original area), to need the surname (xianbei compound surname), wei emperor xiaowen localization reform move capital luoyang, restore to yu.To don a surname's taboo the surname.According to the ancient and modern surnames book dialectical "and so on, a surname male descendants, to name for the surname.Tang dynasty years, set by the royal family of seven last name, a surname's.To the emperor xianzong Li Chunshi for taboo (" pure "" chun"), compound surname instead of a surname's surname.In the song dynasty, and some to restore a surname surnamed.