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Last name Tough (Tof , Tough , Taff ) , in the world, is quite a common surname. The last name Tough is characteristic of Guernsey, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Canada. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Canada. Much less frequently, Tough is the forename as well as the last name.