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Last name Krén (Kren , Krén ) , across the world, is quite a rare cognomen. The family name Krén is habitual in Slovenia, where it is quite a common surname, Czechia, where it is quite a rare surname, and Austria. Measured by absolute frequency, it is the most numerous in Indonesia, Czechia, and the United States. Very seldom, Krén is the forename as well as the last name.