If there is more of a tie than that one Ugaaz then I would say it is plausible.The Somali etymology for Badlay and Harari one are prolly the two most plausible ones, but I think mine makes more sense because Sultan Badlay was a conqueror, and a conqueror fights nations, not bandits.
Considering in Futuh that the leader of the Marehan was Goita Tedros, I’d like to think that the Marehan had close ties with Ethio-Semites. This makes the idea of ”maraxa” a Harari word a plausible etymology for the Marehan clan.
But I remember reading the Ethiopians would take high ranking Adal noble children as hostages so it is possible this is why he is known by this name. It may not even be his name but only what the Christians called him.