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Family name Kopel (Kopel , Koppel , קופל ) , across the world, is a common surname. The surname Kopel is habitual in Estonia, where it is a common surname, Switzerland, where it is quite a common surname, and Israel. Measured by absolute frequency, this name is the most popular in the United States, Estonia, and Switzerland. Very seldom, Kopel is the forename as well as the last name.