The spelling of whisky, or whiskey, differs geographically. As a rule, American and Irish prefer ‘whiskey’ and the Scots, Canadians and the rest of the world’s single malt makers prefer ‘whisky’. This originated during the 19th century. For in around 1870, Scotch whisky was of very low quality, much of it being distilled poorly in Coffey stills. For exportation to America, the Irish distillers wanted to differentiate their product from the poorer Scotch whisky, thus they added the ‘e’ to mark the crucial distinction.