In the world, Masayo (Masayo 
, マサヨ ) is quite a common girly first name. The first name Masayo is habitual in Japan, where it is quite a rare girly name, Australia, where it is a very rare female name, and Brazil, where it is a very rare boy's name. Measured by absolute frequency, it is the most numerous in Japan, the United States, and Brazil. More prevalently, Masayo is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Masayo | Japan, Brazil, Australia, China, United States |
| マサヨ | Japan |
| asukai masayo Japanese court noble (b. 1390) |
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| matsudaira masayo (b. 1587) |
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| masayo tabutchi Japanese nurse, JP (b. 1885) |
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| masayo ikeda Japanese candidate (b. 1958) |
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| masayo fukuda Kirie 切り絵 paper cutting artist (b. 1973) |
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| masayo motoya researcher (ORCID 0000-0003-2566-0382) |
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| masayo sakata researcher |
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| masayo nomura researcher |
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| masayo yoshimura researcher |
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| masayo hayakawa researcher (ORCID 0000-0002-3479-115X) |
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| masayo fujita researcher |
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| masayo soma researcher ORCID ID = 0000-0002-8596-1956 |
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| masayo nagao Japanese voice actress |
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| masayo kojima researcher |
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| masayo ogi researcher, ORCID id # 0000-0001-7347-7406 |
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Abe, Yamada, Shimizu, Kusakawa, Tsujita, Hayashi, Yoshida, Miyazaki, Sugimoto, Kawakami, Kawaguchi, Tsuchiya, Nakamura, Hasegawa, Watanabe, Yamamoto, Matsumoto, Kobayashi, Takahashi, Nishimura, Hashimoto, Wakamatsu, Harada, Nomura, Takeda, Tamura, Ito, Mori, Sato, Ando, Kato, Tada, Wada, Maeda, Saito, Kondo, Yamashita, Inoue, Ogawa, Mizuno, Murata, Sasaki, Suzuki, Kaneko, Komada, Kojima, Kimura, Tanaka, Ikeda, and Yamaguchi