Duff \d(u)-ff\ as a boy's name is of Gaelic origin, and the meaning of Duff is "swarthy". From the Gaelic "dubh", meaning "dark" as a personal characteristic.

Duff has 3 variant forms: Duffey, Duffie and Duffy.

Baby names that sound like Duff are Daffy, Davy, Davi, Dave, Daw, Dev, Dov and Dow.