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Family name Deák (Deak , Deac , Deák ) , all around the world, is a common surname. The last name Deák is habitual in Hungary, where it is a common surname, Romania, where it is quite a common surname, and Aland Islands (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Hungary, Romania, and the United States. Very seldom, Deák is the forename as well as the last name.