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Family name Frithiof (Frithiof , Фритьоф) , all over the world, is a rare last name. The last name Frithiof is characteristic of Northern Europe, particularly Sweden, where it is quite a rare surname, Denmark, where it is a rare surname, and Finland. Not in comparison with a country's population, it is commonest in Sweden, the United States, and Denmark. Also, Frithiof is the forename as well as the last name.