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Across the world, 吉川 (吉川 , Keiji , Yoshikawa ) is quite a rare principally masculine, but scarcely female first name. The first name 吉川 is characteristic of Japan, where it is a rare masculine name, Singapore, and China, where it is a rare principally boy's, but very infrequently girly name. In absolute terms, it is the most numerous in China, Japan, and the United States. Also, 吉川 is the last name as well as the forename.
吉川 is also a name for the fictitious and mythical characters: .