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Across the world, Kiyoo (Kiyoo
) is an extremely rare boy's forename. Much less frequently, Kiyoo is the last name as well as the forename.
Abe, Kubota, Kimura, Tanaka, Matsuda, Shimizu, Kikuchi, Hayashi, Onodera, Yoshida, Sugawara, Takeuchi, Nakamura, Nakajima, Hasegawa, Ishikawa, Watanabe, Yamamoto, Yamazaki, Kobayashi, Takahashi, Hashimoto, Koyama, Suzuki, Sasaki, Ogawa, Doi, Ito, Ono, Ota, Mori, Sato, Arai, Aoki, Kato, Kudo, Yamashita, Goto, Imai, Miura, Saito, Sakai, Chiba, Kawai, Konno, Inoue, Ishii, Onuma, Endo, and Yamaguchi