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Last name Joon (Joon , ジュン , ג'ון ) , in all the world, is a widespread cognomen. The cognomen Joon is characteristic of Japan, where it is quite a common surname, Malaysia, and Estonia, where it is quite a rare surname. In absolute terms, it is commonest in Japan, Malaysia, and India. Much less frequently, Joon is the forename as well as the last name.