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Last name يانسن (Jansen , يانسن ) , all over the world, is a widespread family name. The surname يانسن is habitual in Curacao, where it is a common surname, Netherlands, and Aruba (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Netherlands, Germany, and South Africa. Very seldom, يانسن is the forename as well as the last name.