The primary division is between Rendille versus the remaining languages, for which Heine proposes the terms "Eastern Sam" or "Dad".[4] In this proposal, Baiso forms a Northern branch of Omo–Tana.
Within Blench's proposal, the primary division of Macro-Somali is first between Baiso, Sam, and Somali. Then within Sam, the primary split is between Rendille and Aweer. Girirra is left unclassified within Lowland East Cushitic.[5]
Heine, Berndt (December 1978). Hetzron, Robert; Schuh, Russell G. (eds.). "The Sam Languages. A History of Rendille, Boni and Somali". Afro-Asiatic Linguistics. Monographic Journals of the Near East. 6 (2). Malibu: Undena Publications. hdl:2307/858.