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Cognomen Kallio (カリオ , Kallio , Каллио ) , around the world, is a common surname. The cognomen Kallio is characteristic of Finland, where it is a common surname, Malta, where it is quite a rare surname, and Estonia. Not in comparison with a country's population, it is commonest in Finland, the United States, and Sweden. Much less frequently, Kallio is the forename as well as the last name.