Across the world, Katsuichi (Katsuichi 
) is a very rare male forename. The forename Katsuichi is characteristic of Eastern Asia, particularly China, where it is an extremely rare masculine name. Very seldom, Katsuichi is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Katsuichi | Brazil, China, United States, Japan, Canada |
| katsuichi hiratsuka politician (b. 1910) |
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| katsuichi yamamoto Japanese screenwriter and teacher (1929-) (b. 1929) |
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| katsuichi mori Japanese diver (b. 1929) |
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| sakamoto katsuichi ichthyologist |
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| katsuichi kanemoto researcher |
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Abe, Shimizu, Shibata, Kikuchi, Hayashi, Ichikawa, Yoshida, Murakami, Sakamoto, Sugawara, Sugiyama, Takeuchi, Nakamura, Hasegawa, Ishikawa, Watanabe, Yamamoto, Yamazaki, Yokoyama, Matsumoto, Kobayashi, Takahashi, Shimada, Yamada, Otsuka, Ishida, Ito, Mori, Sato, Aoki, Kato, Kubo, Saito, Sakai, Chiba, Kondo, Nishimura, Inoue, Okada, Masuda, Sasaki, Suzuki, Kimura, Tanaka, Takeda, Hirano, Fukuda, Fujita, Ikeda, and Yamaguchi