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Surname Данн (Dann , Dunn , Dunne ) , worldwide, is a widespread last name. The last name Данн is characteristic of Ireland, where it is a common surname, Marshall Islands, and Isle of Man (explore the name in all countries). Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, Данн is the forename as well as the last name.