The ancestor of the surname Cheng was Bofu, who enfeoffed Yanshi and established the Kingdom of Cheng. The descendants of later generations took the surname of Cheng, and another surname was changed or Yuanji. There were migrations in the pre-Qin period, and the Han, Tang, Ming and Qing Dynasties spread all over the country. Today’s population is 7 million, mainly living in six provinces.