Zheng He was born in Hongwu in the Ming Dynasty (137 1), and his original name was Ma. In the 13th year of Hongwu 138 1 winter, the Ming army attacked Yunnan. Ma, 10 years old, was taken into Ming camp, became a eunuch, and then entered Yan Wangfu. During the Jingnan Rebellion, Ma made meritorious military service for the prince in Zhengzhou, Hebei Province (now Renqiu, Hebei Province, not Zhengzhou, Henan Province). In the second year of Yongle (1404), Ming Taizu Ma Feng Zheng was renamed He and appointed as the eunuch of the Ministry of Internal Affairs. In the sixth year of Xuande (143 1), Zheng He was made a three-treasure eunuch.
Zheng He did not have children. However, in Zheng He's later years, his brother Ma Wenming passed on his eldest son, Mann, to Zheng He, who passed on incense to Zheng He. This was an acceptable compromise at that time, and this is the origin of Zheng He's descendants.
Zheng He, surnamed Ma, was named "Zheng" because of his outstanding military exploits and was renamed Zheng He. The surname is Zheng. So there is no relationship between them! There is no evidence in history that Zheng Chenggong is a descendant of Zheng He.