Well, some say it was named after the bar that first served it. The Nutty Irishman in Long Island, New York, however, does not claim to have invented the cocktail. In fact, they do not even have it on their menu! The original nutty Irishman was made with just hazelnut liqueur and Irish whiskey, but nobody is quite sure who made the first one. But the name, of course, comes from the Irish whiskey and hazelnut liqueur.