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Family name Doughty (Doughty , 道蒂 , Даути ) , throughout the world, is a common last name. The family name Doughty is characteristic of Guernsey, where it is quite a common surname, Brunei, and Barbados. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, Doughty is the forename as well as the last name.