The Khoshut (Mongolian: Хошууд, Khoshuud) are one of the four major tribes of the Oirat people. Originally, Khoshuuds were one of the Khorchin tribes in southeastern Mongolia, but in the mid-15th century they migrated to western Mongolia to become an ally of Oirats to counter central Mongolian military power. Their ruling family Galwas was the Hasarid-Khorchins who were deported by the Western Mongols.
The Khoshuts first appeared in the 1580s and by the 1620s were the most powerful Oirat tribe, led others in the Buddhism conversion. In 1636 Güshi Khan led many Khoshuds to occupy Kokenuur (Qinghai), and he was enthroned as king of Tibet by the 5th Dalai Lama (see also Upper Mongols). The Khoshut Khanate was established in 1642. Some time after 1645, his brother Kondeleng Ubashi migrated to the Volga, joining the Kalmyks. However, many Khoshuts remained in the Oirat homeland Dzungaria under Ochirtu Setsen.
The Khoshuts of the Dzungar Khanate remained influential until the Qing annihilated them in 1755. In 1771 the Volga Khoshuts fled back to Dzungaria with the Kalmyks and were resettled by the Qing around Bosten Lake. They numbered more than 12,000 in 1999. Their small remnants under a Tumen family in Kalmykia were influential until 1917. Another part of them was formed into a separate banner in Bulgan Province, Khovd Province; but they were counted as Torghut who migrated with them in much larger numbers.
[hamagmongol.narod.ru/library/khoyt_2008_r.htm Хойт С.К. Антропологические характеристики калмыков по данным исследователей XVIII-XIX вв. // Вестник Прикаспия: археология, история, этнография. № 1. Элиста: Изд-во КГУ, 2008. с. 220-243.]