In all the world, Katsuo (Katsuo 
, Катсуо 
) is a rare male given name. The first name Katsuo is habitual in Japan, where it is a rare boy's name, the United States, where it is an extremely rare gender-neutral name, and China, where it is an extremely rare boy's name. Very seldom, Katsuo is the last name as well as the forename.
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| Katsuo | China, Japan, Indonesia, United States, Brazil |
| Катсуо | Russia |
| katsuo yamaguchi (b. 1917) |
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| katsuo gomi (b. 1924) |
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| katsuo kawakubo born:1942-06-20|died:1999-04-24|; Kawakubo, Katsuo.; Kawakubo, Katsuo, 1942-; 川久保, 勝夫, 1942-1999; 川久保, 勝夫 (b. 1942) |
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| katsuo harikae Japanese local politician (b. 1945) |
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| katsuo tanaka (b. 1943) |
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| katsuo kuninaka (b. 1950) |
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| katsuo yamada researcher (ORCID 0000-0002-5120-2150) |
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| katsuo yamanaka researcher |
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| katsuo usuda researcher |
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| katsuo kurabayashi researcher |
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| katsuo kogure researcher (ORCID 0000-0002-6741-6428) |
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| katsuo tokushuku researcher |
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| katsuo sekiguchi researcher |
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| katsuo tamaoka |
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| katsuo ikeda |
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Abe, Fukuda, Fujita, Yamada, Shimizu, Kikuchi, Hayashi, Yoshida, Murakami, Sakamoto, Sugawara, Nakamura, Nakayama, Nakajima, Hasegawa, Ishikawa, Watanabe, Yamamoto, Yamazaki, Matsumoto, Kobayashi, Takahashi, Nakano, Tamura, Tanaka, Kimura, Ito, Ono, Ota, Sato, Arai, Kato, Kudo, Goto, Endo, Hino, Hashimoto, Maeda, Saito, Sakai, Chiba, Konno, Inoue, Ishii, Ikeda, Ogawa, Sasaki, Suzuki, Miura, and Yamaguchi