It was Wardey actually, borana expelled Wardey from Diire, then the Wardey conquered WaamoGedo used to be inhabited by the borana oromos the marehan conquered it from them
Wardey Oromos conquered all of Waamo from smaller Somali clans in the 1600-1700’s after Borana under the pagan “prophet” Mooro Uchama chased them out of Liiban and Diire. Ejji Somalis reconquered it in the 1900’s.
Afmadu was their capital, and Gedo comes from one of their chiefs