In hararghe and dir dhabe the lines are blurred, there are people who will tell you their both Somali and Oromo and they number in the millions (Gurgura and Jarso being the main ones). Not to mention the Oromo Gada system which eats entire clans at a time
The only way to really know who’s who is to do abtrsi tests. Dont let them stop at their clan, ask them to go further. If after 8 or so names they count and further down theyre still Muslim names then they’re non-oromo as most hararghe oromos converted within the last few hundred years and after interacting with Somalis/Hararis
Now non-oromo doesn’t necessarily mean Somali. Hararghe once had ethnic groups ranging from Somali, Afar, Argobba, Harari, Silte, Amhara, Harla, Oromo as well as now extinct ones like the Mayya people, pretty much all of these groups became Oromo. All these groups, except the Amhara and Mayya, have also historically been Muslim for over 500 years. There’s no way of knowing who’s who for sure but a breakdown of the Afran qallo subs and which Somali clans are within them is a good indicator.
Afran Qallo:
Dagga- Includes Jarso, Humme and Noole.
Jarso are of dir Somali origin but their are oromos and daroods amongst them. They’re mostly Somali with some Oromos amongst them.
Humme are almost entirely of Somali origin. Although they now no longer exist, it used to include Barsuuq Dir (also claimed by Arap isaaq), Sheekhal and other local clans like samaroon. They’re entirely Somali
Noole are the largest Dagga sub. Most of the Oromo you will find in Dir dhabe are Noole. Noole as a clan is probably majority of Oromo origin however they have subclans that trace to many Somali clans mostly dir and darood. Many noole clans are also harari in origin and in harar Oromo extremists pressure hararis into identifying with Noole to put them under the Oromo umbrella. They’re mostly Oromo (or atleast Somalis assimilated very early on), with some hararis and Somalis amongst them
Oborra- Akichu/Akisho is a subclan of Oborra. Whether they were originally or became it over time allahu aclam. Other than that don’t know much about these guys
Alla- The largest subclan in Afran qallo. I don’t know much about them either as they hardly border Somalis (except maybe samroon and sheekhaal) but I heard there are Argobba amongst them
Baabili- kuwaan are just straight up Hawiye man. Their subclans include “Karanla” and “Gugundhaba”. They know their hawiye themselves and aren’t fully assimilated, just in politics.
Next biggest contester in hararghe is Ittu oromos who have Argobba, Harari, Afar, Somali, Oromo and whatever other ethnic group in the region who are now part of them. After them you have Karaayu who some say are entirely Karanle in origin. The name “Karaayu” is said to be a mispronounciation of the “Kaariye” subclan of Karanle Hawiye