It's called Sebei.
Sebei is an ethnic group of Uganda and Sudan. They speak Sebei, a Nilotic language. Many members of this ethnic group occupy three districts of Kapchorwa, Kween and Bukwa found in Eastern Uganda.
Their territory borders the Republic of Kenya which is a home to more than five million Kalenjin, a large ethnic group to which the Sebei belongs. The Sebei, now known mainly as Sabiny, speak Kupsabiny, a Kalenjin dialect spoken by other smaller groups of Kalenjin stock around Mount Elgon. The Sebei and these smaller groups inhabiting the hills of Mount Elgon collectively are referred to as the
Saboat.