Olkhunut (Mongolian:Олхуноуд, Олхонууд, Олгонууд, Olhonuud) was the tribe of Hoelun, the mother of Genghis Khan. They helped Genghis to defeat the Naimans. The Olkhunut people were very closely related to the Hongirad clan. Their descendants still live in Khovd Province of Mongolia and in Inner Mongolia.
References
Olkhonud Wikipedia(Text) CC BY-SA