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Family name Hammar (Hammar , Хаммар , Hamarr ) , all over the world, is quite a common cognomen. The family name Hammar is characteristic of Sweden, where it is quite a common surname, Finland, where it is quite a rare surname, and Algeria. Measured by absolute frequency, it is the most numerous in Sweden, Algeria, and the United States. Much less frequently, Hammar is the forename as well as the last name.