The article discusses the origin of the Sakha people. The article establishes the connection between the ancestors of the Sakha with the Central Asian Tatars, some of which in the course of civil wars XIII century. It appeared in the hangar. They were known by the name usutu-mangun or water-tatars, they belonged to the Ust-Talkinskaya archaeological culture Angara region XII–XIV centuries. We provide information from the Yakut legends grandparent, which featured Elley tribe "tataar" his father Tataar-time. It is proved that ethnonyms Mongolia and tataar were known ancestors of the Sakha. Endoethnonym Yakuts: Saha and uraanhay also have communication with ethnonyms Zubu (sog-po) – refer to the Tatars and uluhou (Uriangkhai) – ancestors of the Tatars. Central Asian Tatars took an active part in shaping Kimak-Kipchak tribes. This version is compared to the participation of archaeologists Kimak-Kipchak component in addition Ust-talkintsev and Yakut culture. Thus, the beginning of ethnogenesis Sakha ancestors associated with the region of Lake Baikal, where the Turkic ancestors of the Sakha contact with the Mongol tribes.