1, Liu, surnamed Qi, has two homologous branches, one is directly from Liu Lei and was formed in Xia Dynasty; In the early Spring and Autumn Period, a scholar society composed of descendants of Liu Lei was formed. Liu Lei was born in the late Xia Dynasty. He studied dragon training with the master of dragon breeding technology, and domesticated four dragons for Kong Jia, the thirteenth emperor of Xia Dynasty, so he was named dragon lion by Kong Jia.
2. Liu Lei lived in the south of Yanshi County, Henan Province, when he was a Kongjia dragon. Later, due to poor reproduction, a female dragon died. Liu Lei was afraid that Kong Jia would be punished, so she secretly fled to Lu Xian County (now Lushan County, Henan Province) with her family. Liu Lei's descendants took Liu Lei's name as their surname, which was the earliest surname of Liu in China.