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Cognomen Jonason (Jonason ) , across the world, is a rare last name. The last name Jonason is characteristic of Sweden, where it is quite a rare surname, the United States, where it is a very rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in Sweden, the United States, and India. Also, Jonason is the forename as well as the last name.