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Family name Sijen (Sijen ) , around the world, is a very rare last name. The cognomen Sijen is habitual in Netherlands, where it is a rare surname, Malaysia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Netherlands, Malaysia, and China. More prevalently, Sijen is the forename as well as the last name.