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Last name Taff (Dafydd , Tough , Taff ) , in the entire world, is quite a common cognomen. The family name Taff is characteristic of Guernsey, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Jamaica. Not in comparison with a country's population, this name is the most popular in the United States, the United Kingdom, and Canada. Likewise, Taff is the forename as well as the last name.