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Last name Diak (Diak , Диак , Дьяк ) , worldwide, is quite a rare surname. The family name Diak is habitual in Jordan, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Lithuania. Not in comparison with a country's population, this name is the most popular in Jordan, the United States, and Poland. Much less frequently, Diak is the forename as well as the last name.