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Surname Kosmas (Kosmas , Козьма , Κοσμάς ) , in all the world, is a common cognomen. The family name Kosmas is habitual in Greece, where it is a common surname, Namibia, where it is quite a rare surname, and Ukraine. In absolute terms, it is commonest in Greece, Ukraine, and Tanzania. Also, Kosmas is the forename as well as the last name.