During the Zhou Dynasty, three sons of the royal family, Ji Ji and Ji Li, were officials and doctors in North Korea, which became a much-told story for a while. Because all three fiefs were in Yin, later generations took Yin as their surname.
There is also a saying that Zhou Wenwang's third son, his descendant Guan Zhong, was the prime minister of Qi Huangong, and he helped Qi Huangong become the overlord in the Spring and Autumn Period. Guan Zhong later offended Tan Gong's son, a businessman, and retaliated against Guan Zhong after regicide. His descendants fled to Chu for refuge. After the seventh Sun Guanxiu, he was named a doctor and called Yin.
Xinye, Henan Province, is the county seat of Yin surname in history, and Yin surname was once prominent here.