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Surname Sober (Sober , Sobrius) , all around the world, is quite a rare cognomen. The surname Sober is habitual in Estonia, where it is quite a common surname, Slovenia, where it is quite a rare surname, and Hungary, where it is a rare surname. Measured by absolute frequency, it is commonest in the United States, Indonesia, and Estonia. Very seldom, Sober is the forename as well as the last name.