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Surname Dalphin (Dauphin , Dalphin ) , all over the world, is a common cognomen. The surname Dalphin is characteristic of Reunion, where it is quite a common surname, Luxembourg, and France, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in France, the United States, and Germany. Very seldom, Dalphin is the forename as well as the last name.