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Cognomen Kræft (Kreft , Cancer , Kræft) , around the world, is a common family name. The family name Kræft is habitual in Slovenia, where it is quite a common surname, Germany, where it is quite a rare surname, and Poland. Not in comparison with a country's population, it is the most numerous in Germany, Poland, and Indonesia. Likewise, Kræft is the forename as well as the last name.