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Last name Chiaki (Chiaki , チアキ , 千晶 , among others...) , across the world, is a common cognomen. The cognomen Chiaki is habitual in Japan, where it is quite a common surname, Taiwan, where it is a rare surname, and Malaysia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Japan, China, and Indonesia. Much less frequently, Chiaki is the forename as well as the last name.