In the world, Kōichi (浩一 
, Kōichi, Коити) is a rare dominantly male, but uncommonly girly forename. The first name Kōichi is habitual in Eastern Asia, particularly China, where it is a very rare mostly masculine, but seldom feminine name. Very seldom, Kōichi is the last name as well as the forename.
Kōichi is also a name for the fictitious and mythical characters: Kōichi Zenigata , the fictional human from Lupin III and Kōichi Sakuranomiya , the fictional character from Blend S.
| kōichi miyake (b. 1876) |
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| kōichi satō Japanese accounting academic (b. 1905) |
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| kōichi sagawa (b. 1907) |
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| kōichi iwase (b. 1917) |
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| kōichi ishiyama (b. 1924) |
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| kōichi takita (b. 1927) |
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| kōichi yokoyama Japanese astronomer (b. 1940) |
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| kōichi ishikawa Japanese civil servant (b. 1942) |
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| kōichi kawata (b. 1935) |
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| kōichi ōmura CN (b. 1938) |
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| kōichi maeda Journalist and director of Japanese Medical Marijuana Association (b. 1950) |
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| kōichi hashiguchi (b. 1942) |
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| kōichi iibuchi (b. 1946) |
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| kōichi horikoshi japonese historian (1957- ) (b. 1957) |
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| kōichi ōkoshi (b. 1948) |
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