Hawiye is Oromo. Even the Word hawiye is an aromo word. It Means notorious ganster
Even the Names of his Sons were oromo
Gorgarte, Karanle, gugundhabe, Jambelle, raaranle, Xaskul all this are oromo names.
Hawiye himself is burried In Oromo land. Here is the proof
http://www.fallingrain.com/world/ET/12/Bet_Hawiya.html