Liu Shangwuyou
There are two branches of the Liu surname that come from the same source: one comes directly from Liu Lei and was formed in the Xia Dynasty; the other comes from the scholar association of Liu Lei's descendants, It was formed in the early Spring and Autumn Period.
Liu Lei was born in the late Xia Dynasty. He once learned how to tame dragons from the Cuanlong clan who was proficient in dragon raising techniques. He tamed four dragons for Kong Jia, the 13th emperor of the Xia Dynasty, so he was given the surname by Kong Jia. For the Yulong clan. When Liu Lei was raising dragons for Kong Jia, he lived in the south of Yanshi County, Henan Province. Later, due to poor breeding, a female dragon died. Liu Lei was afraid that Kong Jia would be punished, so he secretly fled south with his family to Lu County (now Lushan County, Henan Province) and hid. Liu Lei's descendants took Liu Lei's name as their surname, which was the earliest Liu surname in China.