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Family name Blyth (Blyth , Блит , بليث ) , throughout the world, is quite a common cognomen. The surname Blyth is characteristic of British Virgin Islands, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Australia. Not in comparison with a country's population, it is commonest in the United Kingdom, Australia, and the United States. Much less frequently, Blyth is the forename as well as the last name.