The origin of the surname "Wan" is as follows: 1. It originated from the Ji surname and was formed by taking the grandfather's given name as the clan name. According to "Wan Xing Tong Pu", at the beginning of the Western Zhou Dynasty, Duke Rui was enfeoffed in Rui (now Ruicheng County, Shanxi Province). Later, there was Rui Bo Wan, and the collateral descendants of his clan took his grandfather's given name "Wan" as the clan name. It also originated from the Ji surname and was formed by taking the grandfather's given name as the clan name. During the Spring and Autumn Period, Bi Wan, a doctor of the Jin State, was a descendant of Bi Gonggao and the founder of the Wei State. His collateral descendants took his grandfather's given name "Wan" as the clan name. During the Northern and Southern Dynasties, it was changed from the compound surnames of the Xianbei ethnic group. The compound surnames Tuwan and Wanniuyu from the northern part of the frontier were changed to the Han surname "Wan".