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Last name アオイ (アオイ , Aoi ) , in all the world, is a common cognomen. The surname アオイ is characteristic of Japan, where it is quite a common surname, Nigeria, where it is a rare surname, and Hong Kong. Not in comparison with a country's population, it is commonest in Japan, Nigeria, and Indonesia. Very seldom, アオイ is the forename as well as the last name.