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Family name Kumpu (Kumpu ) , around the world, is a rare cognomen. The last name Kumpu is characteristic of Finland, where it is quite a rare surname, Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Finland, Thailand, and the United States. Much less frequently, Kumpu is the forename as well as the last name.