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Last name Krejn (Chrzan , Krejn , Крейн ) , around the globe, is quite a rare family name. The cognomen Krejn is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Slovakia, and Czechia. Measured by absolute frequency, it is commonest in Poland, the United States, and Czechia. Also, Krejn is the forename as well as the last name.