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Last name Bujan (Bujan , Буян , Бужан ) , around the world, is quite a common cognomen. The cognomen Bujan is habitual in Croatia, where it is quite a common surname, Belarus, where it is quite a rare surname, and Argentina. In absolute terms, the name is most common in Argentina, Spain, and Belarus. Much less frequently, Bujan is the forename as well as the last name.