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Family name دياك (Deak , Deac , Diak ) , around the world, is a common cognomen. The last name دياك is characteristic of Hungary, where it is a common surname, Romania, where it is quite a common surname, and Aland Islands (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Hungary, Romania, and the United States. Very seldom, دياك is the forename as well as the last name.