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Last name Aoi (アオイ , Aoi , Аои ) , around the globe, is a common cognomen. The cognomen Aoi is characteristic of Japan, where it is quite a common surname, Armenia, where it is quite a rare surname, and Nigeria, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Japan, Nigeria, and Indonesia. Much less frequently, Aoi is the forename as well as the last name.