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Family name Duff (达夫 , Duff , داف , among others...) , in all the world, is a common last name. The family name Duff is characteristic of Northern Europe, particularly Aland Islands, where it is quite a common surname, Ireland, and Guernsey (explore the name in all countries). In absolute terms, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, Duff is the forename as well as the last name.