No. of children Father Notes 1,000-2,000 Genghis Khan He is said to have fathered at least 1,000 children, possibly as many as 2,000 from as many as 3000 wives. Genetic analysis has shown he is a male-line ancestor of 0.5% of the world's population.[85] 867+ Ismail Ibn Sharif Alaouite sultan of Morocco, he is said to have fathered children with multiple wives and concubines. 300–600 Bertold P. Wiesner This fertility doctor used his own sperm to impregnate customers between 1943 and 1962.