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In the world, Kōsuke (Kosuke , コウスケ , Kōsuke) is quite a rare unisex forename. The given name Kōsuke is habitual in Japan, where it is quite a rare gender-neutral name, Australia, where it is a very rare masculine name, and the United States. Not in comparison with a country's population, it is the most numerous in Japan, China, and the United States. More prevalently, Kōsuke is the last name as well as the forename.
Kōsuke is also a name for the fictitious and mythical characters: Kōsuke Kindaichi , the fictional Japanese detective created by Seishi Yokomizo; Ueki Kosuke , the fictional character from The Law of Ueki and Kosuke Wakamatsu , the character from Kuroko's Basketball.