The English and the Americans may say "Scotch" but in Scotland it's "Scots". (Scotch is whiskey). It's easy to be confused, "Scotch" whiskey is made by the Scottish and there were many colonial immigrants to America known as Scotch-Irish, really Scots-Irish. If you are fortunate enough to go to Scotland you may want to pronounce it as Scot instead of Scotch. The Scotch version has been accepted as colloquial but the literary version and more pleasing to the Scots is ... Scot.
Suellen Ocean is the author of Secret Genealogy a how-to for tracing ancient Jewish ancestry available at Amazon, B&N and Ocean-Hose.