The Rendille people are believed to have originally migrated down into the Great Lakes area from Ethiopia in the more northerly Horn region, following the southward population expansions by the Oromo and later the Somali.  

Traditionally, they are nomadic pastoralists, tending camels, sheep, goats, and cattle. The camels are generally kept in the northern part of their territory and the cattle in the southern section.  The Rendille people speak the Rendille language as a mother tongue (also known as Rendile or Randile) and they belong to the Cushitic branch of the Afroasiatic family.  

Source: Rendille people – Wikipedia