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Last name Klajn (Klajn , קליין , Клайн ) , around the globe, is quite a common surname. The surname Klajn is characteristic of Israel, where it is quite a common surname, Serbia, where it is quite a rare surname, and Croatia. Measured by absolute frequency, it most frequently occurs in Israel, Poland, and Serbia. Very seldom, Klajn is the forename as well as the last name.