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Surname Coso (Coso , Косо ) , all over the world, is quite a rare family name. The cognomen Coso is habitual in Bosnia and Herzegovina, where it is quite a rare surname, Serbia, and Kyrgyzstan, where it is a rare surname. Measured by absolute frequency, it is commonest in Philippines, Spain, and Serbia. Much less frequently, Coso is the forename as well as the last name.