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Last name ちあき (Chiaki , ちあき) , around the world, is quite a rare surname. The surname ちあき is habitual in Taiwan, where it is a rare surname, Japan, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Japan, China, and Indonesia. More prevalently, ちあき is the forename as well as the last name.