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Last name Daff (达夫 , Daff , Дафф ) , in the entire world, is quite a common surname. The surname Daff is characteristic of Sub-Saharan Africa, particularly Senegal, where it is quite a common surname, the Republic of the Congo, where it is quite a rare surname, and Guinea. Not in comparison with a country's population, this name is the most popular in Senegal, the Democratic Republic of the Congo, and China. Likewise, Daff is the forename as well as the last name.