yeah but his name is Durotan according to the official Blizzard novel Lord of the Clans, I'm guessing Thrall modified the name a bit as it would be a bit confusing saying they're going to Durotan so he just named the nation Durotar just as Orgrimar is named after Orgrim Doomhammer, the one who passed on the Doomhammer and the mantle of being Warchief to Thrall