Han Wan was a charioteer for his nephew Duke Wu of Quwo and helped to kill Marquess Ai of Jin. Duke Wu of Quwo then took over the throne of Jin as Duke Wu of Jin, who then bestowed Han Wan the land of Han. Han Wan's descendants later adopted Han as the clan name.
Han Wan's descendants became high-ranking officials in Jin. The family became very powerful and eventually led to the Partition of Jin.