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Surname Dyfan (Dyfan ) , all around the world, is a very rare last name. The family name Dyfan is habitual in Denmark, where it is a rare surname, Indonesia, where it is a very rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in Indonesia, the United Kingdom, and the United States. More prevalently, Dyfan is the forename as well as the last name.