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Family name Aika (Aika , Айка , アイカ ) , in the entire world, is a common cognomen. The surname Aika is habitual in Japan, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and India, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Japan, India, and Indonesia. Very seldom, Aika is the forename as well as the last name.