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Cognomen Hasso (Hasso , Гассо , Хассо ) , all around the world, is quite a rare surname. The surname Hasso is characteristic of Syria, where it is quite a rare surname, Slovakia, and Iraq. Not in comparison with a country's population, the name is most common in Syria, Iraq, and the United States. More prevalently, Hasso is the forename as well as the last name.