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Cognomen Cossus (Gusano
, Косс
, Cossus
) , around the world, is a rare surname. The last name Cossus is characteristic of Eastern Europe, particularly Ukraine, where it is a rare surname, Belarus, and Russia. Not in comparison with a country's population, it is commonest in Russia, Ukraine, and Spain. Much less frequently, Cossus is the forename as well as the last name.