When Koreyoshi was assigned to Iga Province, he called himself as 'Ouchi' for the family name, however, he was nothing to do with the Ouchi clan in Suo Province, which later grew up to be a daimyo (feudal lord) at the Sengoku Period (the Period of Warring State).
惟義が伊賀国に赴任した時期に大内姓を称したが、後に戦国大名となる周防国の大内氏とは関係がない。