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Surname Oll (Olt , Oll , Олль ) , in all the world, is quite a rare family name. The family name Oll is characteristic of Estonia, where it is quite a common surname, Romania, where it is quite a rare surname, and Hungary, where it is a rare surname. In absolute terms, the name is most common in Germany, Estonia, and the United States. Much less frequently, Oll is the forename as well as the last name.