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Cognomen Ingen (Ingen , インゲン , Ingeen) , globally, is quite a rare last name. The cognomen Ingen is habitual in Netherlands, where it is quite a common surname, Hong Kong, where it is a rare surname, and Sweden. Not in comparison with a country's population, it is the most numerous in Netherlands, Japan, and Germany. Much less frequently, Ingen is the forename as well as the last name.