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Last name Jonker (Jonker , Йонкер , جونكر ) , across the world, is a common surname. The family name Jonker is characteristic of Netherlands, where it is quite a common surname, South Africa, and Malta, where it is quite a rare surname. In absolute terms, the name is most common in Netherlands, South Africa, and the United States. Very seldom, Jonker is the forename as well as the last name.