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Cognomen Bíró (Biro , Bíró , Биро ) , in the entire world, is a common surname. The family name Bíró is characteristic of Eastern Europe, particularly Hungary, where it is a common surname, Romania, where it is quite a common surname, and Slovakia. Measured by absolute frequency, this name is the most popular in Hungary, Romania, and Japan. Also, Bíró is the forename as well as the last name.