that is interesting cuz, i heard the bordering gallas called their side of webe shabelle (sidamic river) and of course harari is title even the exploring brits knew thatI need to reread the Futuh and do a very long post on it sometime. Just gotta get my laptop fixed. There's a lot of secondary source bullshit about what's in it. When you actually read the book you realize, for example, that "Hararis" as an ethnicity are never even mentioned and Harar is just an important settlement not tied to any particular ethnic or tribal group. The only clearly recognizable Muslim ethnicities I remember seeing that exist today were Somalis and Sidamics like Hadiyas and Gedeos.
In fact, I'll have to really pore over it again but I got an impression from the book that the non-Somali Muslim citizens of the eastern Horn back then may have mostly been Sidamics, and possibly some Southern Ethiosemites who intermingled with them and have substrates from them the way Hararis and the Gurage do. The eastern Horn interior was mostly Somali and Sidamic before the Oromo expansions from the impression I got.
One other fun fact is that the Somali tribes outlined to live in the general area around Harar back then are more or less the same tribes Richard F. Burton describes in his 1800s book 3 centuries later and the same tribes this Somali map shows in the 1900s a century after that:
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Bartire, Geri Kombe, Karanle ("Hawiya" in the Futuh), Gurgura, Barsuk, Mareexaan, Habar Awal ("Habar Magadli" in the Futuh), Samaroon ("Habar Maqdi" in the Futuh), Yabbare and some others I'm missing including some tribes the book claims are Somali but can't be matched to modern ones today. Only the Harti standout but the author makes a point of telling you they are outsiders from Maydh in Sanaag.
But anyway, it's really cool to realize the same tribes have lived in that general area for the last 500 years. Puts a bit of a good bookmark on Somali migrations if the tribal makeup of areas like that was already mostly established half a millennia ago.