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Surname Radan (Radan , Радан , رادان ) , globally, is quite a common last name. The surname Radan is habitual in Southern Europe, particularly Croatia, where it is quite a common surname, Bosnia and Herzegovina, and Serbia, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Philippines, Iran, and Croatia. Much less frequently, Radan is the forename as well as the last name.