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Last name Jadan (Jadan , Жадан ) , in the entire world, is quite a common cognomen. The family name Jadan is characteristic of Ukraine, where it is quite a common surname, Croatia, where it is quite a rare surname, and Russia. Not in comparison with a country's population, it most frequently occurs in Ukraine, Russia, and Kazakhstan. Much less frequently, Jadan is the forename as well as the last name.