Tumbinai Khan, Tumbinai Setsen or, Timurids say Tumanay Khan (Mongol: Тумбинай хаан, Тумбинай сэцэн, Туманай хаан; died 1130 CE.) was the Khan of the Borjigin Imperial mongol tribe, He lived during the 11th and 12th Centuries, His son and successor Khabul Khan was the founder of the Khamag Mongol after his death, His second son Khaduli agreed with his brother Khabul Khan, Tumbinai was a great-great-grandfather of Genghis Khan founder of the Mongol empire, through his eldest son Khabul Khan and the great-great-great-great-great-great-grandfather of Amir Timur, who was the founder of the Timurid empire at Central Asia, through his second son Khaduli through his great-grandson Qarachar Barlas, who created Barlas Confederacy Clan, He was the son and successor of Baishinkhur Dogshin who was the son of Kaidu Khan.

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敦必乃，一作屯必乃薛禅。

蒙古部海都汗的孙子，拜姓忽儿的长子，成吉思汗的高祖父，生子札黑速、八林西博尔术、合出里、撒木哈术、巴特盖尔齐、合不勒（《元史》作葛不律寒）、兀都尔伯颜、不鲁勒札儿、乞塔台斡赤斤

。

蒙古部开始壮大，敦必乃生活在12世纪初，合不勒生活在金朝初年。合出里是帖木儿祖先，不勒鲁札儿是杜格拉特部祖先。

据说帖木儿帝国的开基皇帝帖木耳，也是他的子孙。