Globally, Iwao (Iwao 
, Ивао) is quite a rare male forename. The given name Iwao is habitual in Japan, where it is a rare boy's name, Brazil, and the United States, where it is a very rare boy's name. Very seldom, Iwao is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Iwao | Philippines, Brazil, United States, Japan, China |
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iwao ayusawa writer on Labour Relations (1894-1972), US (b. 1894) |
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iwao ojima American chemist, US (b. 1945) |
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| iwao hino botanist (b. 1898) |
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| iwao tokito Japanese water polo player, JP (b. 1908) |
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| iwao moriyama American statistician, US (b. 1909) |
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| iwao kuromatsu (b. 1906) |
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| iwao takamoto American animator (1925-2007), US (b. 1925) |
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| iwao iwasaki Japanese lyricist and teacher (b. 1925) |
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| iwao munakata (b. 1920) |
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| iwao onizuka (b. 1928) |
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| iwao iwasaki (b. 1929) |
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| iwao honjo (b. 1935) |
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| iwao maeshima (b. 1935) |
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| iwao nakayama Japanese ice hockey player, JP (b. 1949) |
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| iwao natsui (b. 1939) |
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Abe, Yoshida, Maruyama, Murakami, Sakamoto, Kawakami, Nakamura, Nakayama, Nakagawa, Nakajima, Hasegawa, Fujiwara, Ishikawa, Watanabe, Yamamoto, Yamazaki, Yokoyama, Matsumoto, Kobayashi, Taniguchi, Takahashi, Hashimoto, Okamoto, Iwasaki, Hayashi, Shimizu, Ito, Ono, Oya, Mori, Sato, Kato, Kono, Saito, Kondo, Fujii, Yamashita, Inoue, Ogawa, Sasaki, Suzuki, Koyama, Kimura, Daisen, Tanaka, Nakano, Fujita, Yamada, Ikeda, and Yamaguchi