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In all the world, Duff (达夫 , Duff , داف , among others...) is quite a rare dominantly masculine, but seldom female first name. The forename Duff is habitual in Nigeria, where it is a rare gender-neutral name, Hong Kong, where it is a rare male name, and Libya. Not in comparison with a country's population, it is the most numerous in China, Nigeria, and the United States. More prevalently, Duff is the last name as well as the forename.
Duff is also a name for the fictitious and mythical characters: Duff Killigan , the fictional character from Kim Possible.