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Cognomen Биро (Biro , Bíró , Byro ) , in the entire world, is a common surname. The cognomen Биро is characteristic of Eastern Europe, particularly Hungary, where it is a common surname, Romania, where it is quite a common surname, and Slovakia. In absolute terms, it is commonest in Hungary, Romania, and Japan. Also, Биро is the forename as well as the last name.