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Surname Djaja (Djaja , دجاجة, จาจา ) , worldwide, is a common cognomen. The surname Djaja is habitual in Indonesia, where it is quite a rare surname, Serbia, and Singapore, where it is a rare surname. Not in comparison with a country's population, it is commonest in Indonesia, Serbia, and Malaysia. Very seldom, Djaja is the forename as well as the last name.