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Last name 吉川 (吉川 , Keiji , Yoshikawa ) , across the world, is quite a common cognomen. The cognomen 吉川 is characteristic of Japan, where it is quite a rare surname, Hong Kong, and Singapore, where it is a rare surname. Measured by absolute frequency, it is commonest in Japan, China, and Brazil. Likewise, 吉川 is the forename as well as the last name.