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Last name Kosiba (Kosiba
, 小柴
, Косиба
) , all around the world, is quite a rare family name. The cognomen Kosiba is characteristic of Eastern Europe, particularly Poland, where it is quite a rare surname, Slovakia, and Hungary. Measured by absolute frequency, it is commonest in Poland, the United States, and Brazil. Also, Kosiba is the forename as well as the last name.