1, from Qi, followed by Yan Di Yao Tangtao. Later, Qi was sealed in Liu Guo, which is now Tang County, Hebei Province. His son and grandson took the country as their surname, and the history called Wei Liu authentic. 2, from Ji surname, is a descendant of Zhou. According to legend, after the death of Zhou Wuwang, Zhou Chengwang succeeded to the throne and named Wang Ji's son Liu Yi, now Yanshi, Henan. His grandson takes the land as his surname, and Cheng Ji's surname is Liu. 3. From his surname, for his family, he changed his surname or gave it to Liu. 1. Emperor Gaozu Liu Bang married the princess to Modu, the leader of Xiongnu, in order to relieve the threat of Xiongnu. According to the custom of Xiongnu, nobles all take their mother's surname, so all the descendants born to the princess are surnamed Liu. Second, Qi Lou Jing made contributions to Liu Bang for many times, and Liu Bang changed his surname to Liu; In order to thank Xiang Bo for helping him many times, Liu Bang named him Liu, and named many survivors of Xiang Bo Liu. Wang Chang, who fought against Wang Mang in the Eastern Han Dynasty, made great contributions in the battle of Kunyang, and later changed his name to Liu. Thirdly, after Emperor Xiaowen of the Northern Wei Dynasty moved to Luoyang, the compound surname of Xianbei people was changed to Liu, which became one of the most popular surnames at that time. Other ethnic minorities who moved to the Central Plains also changed their surnames to Liu.