Yesugei

Yesugei Baghatur or Yesükhei (Modern Mongolian: Есүхэй баатар, Yesukhei baatar; died 1171), was a major chief of the Khamag Mongol confederation and the father of Temujin, Genghis Khan. Yesugei's name literally means "like nine", meaning he had the auspicious qualities of the number nine, a lucky number to the Mongols.

Yesugei was the son of Bartan Baghatur, who was the son of Khabul Khan, who was recognized as a khagan by the Jin Dynasty. Khabul Khan was, in turn, the grandson of the Mongol chief Khaidu, the first to try to unite all of the Mongols. Temujin's mother was Hoelun (a daughter of the Olkhunut forest tribe), abducted by Yesugei and his brothers from her newlywed husband.

When Temujin was nine years old, Yesugei died. The Secret History records that he was poisoned by Tatars while sharing a meal on the way home from finding Temujin a wife.

Yesugei had also a "bloodbrother" or anda, Toghrul Khan (later Wang Khan). Toghrul initially helped Temujin conquer the tribes, but later defected to Genghis' anda and rival, Jamukha.

Yesugei in "The Barbecue, the Movie, & Other Unfortunately Not So Relevant Material"
When a mysterious visitor in the garb of a Mongol tribesman approached T.G. Kahn in his office, Kahn perceived him as a prank sent by the old professor, and said "I presume you know my father." The visitor replied "No, Excellency, never did I have the privilege of meeting that great hero Yesugei." Kahn was impressed that the visitor had done the research of finding out the name of Yesugei, father of Genghis Khan. In short order, the visitor cleared up the confusion by explaining that he had mistaken Kahn for Genghis Khan himself.