Angus Lord of Bute & Arran (younger son of Somerled, King of the South Isles), killed (with his son James and other sons) 1210 by the men of Skye. [Burke's Peerage]
Some sources have Angus's surname (as well as James-his son) as MacRory, but I believe that the "MacRory" name comes from the descendants of Rory, son of Rognvald, son of Somerled.