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Cognomen Hanai (Hanai , هناي , 花井 ) , around the globe, is quite a rare surname. The last name Hanai is characteristic of Namibia, where it is quite a rare surname, Oman, and Sudan. Not in comparison with a country's population, the name is most common in Sudan, Malaysia, and Oman. Also, Hanai is the forename as well as the last name.