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Surname Sontag (Sontag , Сонтаг , סונטג ) , worldwide, is quite a rare cognomen. The surname Sontag is habitual in Western Europe, particularly Luxembourg, where it is quite a rare surname, Germany, where it is a rare surname, and France. In absolute terms, it is commonest in the United States, Germany, and France. Very seldom, Sontag is the forename as well as the last name.