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Cognomen Boian (Боян , Boian , Бойан ) , in the world, is quite a rare family name. The family name Boian is characteristic of Aland Islands, where it is quite a common surname, Bulgaria, and Romania, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Eastern Europe, particularly Bulgaria, Romania, and Ukraine. Likewise, Boian is the forename as well as the last name.