Need more genetic testing, their territory comprises all the land where modern-day Dir/Isaaq and historical land Somali land deep into Ethiopia.
I wouldn't be surprised if they were a tribal confederation, sadly very little is written about them, bar connection with the language spoken by the Yibir and Madhiban, which is a dialect of Somali.
"Recent excavations indicated consumption of wild pigs were prevalent in Harla as opposed to in neighboring Kingdom of Aksum. The excavations were done by the Institute of Arab and Islamic Studies of the University of Exeter as part of the Becoming Muslim project at the urban sites of Harlaa in 2017-2019, Harar in 2014-2018, and Ganda Harla 2014, located in the eastern part of Ethiopia. Substantial assemblages of faunal remains were recovered over the seasons."
The Ganda Harla is an abandoned settlement located 12.5 km southeast of Harar on a hill west of the village of Sofi and is linked with the Harla in local tradition. The zooarchaeological data indicated the inhabitants were
hunters of wild animals in open terrain and scrub hillsides with the exception of
Kobus kob which are more commonly found at lower elevations such as in valleys and riverine grasslands. The locals also kept domesticated animals such cattle (
Bos taurus/indicus), goat (
Capra hircus), sheep, and transport livestock such as donkey, horse and camel."
Madhiban have always been expert hunters/Artisians and they've lived within most Somali societies, this culture of looking down on them probably stems from Waaq belief of not killing wild game, so wild animals don't target your herds.