Not as prolific as the khan? Maybe a nicer fella, just popular.
No one knows if the so-called Genghis DNA is actually from Genghis, perhaps one day his long-hidden tomb will be found and DNA retrieved. Could be some other Dark Ages east Asian rapist. Niall has a similar physical obscurity, was legendary, but has a large number of lines and people claiming to be his descendants, and the DNA matches up. :^)