All around the world, Yudai (Yudai 
) is a rare predominantly male, but very infrequently girly first name. The forename Yudai is habitual in Japan, where it is a rare male name, Indonesia, where it is a very rare male name, and China, where it is an extremely rare epicene name. Very seldom, Yudai is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Yudai | Indonesia, Myanmar, Japan, China, United States |
| yudai masuoka researcher |
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| yudai kabata researcher |
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| yudai shibata researcher |
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| yudai miyashita researcher (ORCID 0000-0001-8959-3823) |
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| yudai kai researcher |
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| yudai izumi researcher ORCID ID = 0000-0003-4524-9590 |
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| yudai okishio researcher |
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| yudai okabe researcher |
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| yudai suzuki researcher (ORCID 0000-0001-6322-3402) |
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| yudai huang researcher (ORCID 0000-0002-5833-7242) |
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| yudai tamura researcher (ORCID 0000-0002-5596-8436) |
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| yudai yamaoki researcher (ORCID 0000-0002-8927-4985) |
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| yudai yamamoto researcher ORCID ID = 0000-0002-8173-406X |
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| yudai morisaki researcher |
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| yudai nakai researcher |
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Abe, Harada, Ishida, Yamaga, Yamada, Uchida, Shinada, Shimizu, Tashiro, Iwasaki, Murakami, Shimabara, Kawasaki, Nakamura, Ishikawa, Watanabe, Yamamoto, Matsumoto, Kobayashi, Takahashi, Nishikawa, Nishiyama, Nemoto, Tanaka, Kimura, Aoyagi, Ito, Iga, Ota, Mori, Sato, Aoki, Kato, Koga, Yano, Ueda, Yamashita, Mutoh, Chiba, Nakai, Honma, Fujii, Inoue, Okuda, Ogawa, Matsuo, Sasaki, Suzuki, Saito, and Yamaguchi