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Last name Krain (كرين , Krain , Крайн ) , around the world, is quite a rare surname. The last name Krain is habitual in Iraq, where it is quite a rare surname, Estonia, and Syria, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Iraq, Germany, and Sudan. Very seldom, Krain is the forename as well as the last name.