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Cognomen Kaikai (Kaikai , 开开 , 开凯 ) , throughout the world, is quite a rare last name. The cognomen Kaikai is characteristic of Sierra Leone, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and Kenya, where it is a rare surname. In absolute terms, it is the most numerous in Sierra Leone, China, and Kenya. More prevalently, Kaikai is the forename as well as the last name.