Family name Даф (Duff 
, Daff 
, Dafs 
) , all over the world, is a common surname. The last name Даф 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, Даф is the forename as well as the last name.