Surname Amagai (Amagai 
) , in the entire world, is a rare last name. The surname Amagai is characteristic of Japan, where it is a very rare surname, Nigeria, and Brazil, where it is an extremely rare surname. More frequently, Amagai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Amagai | Japan, China, Nigeria, United States, Brazil |
| hiroyuki amagai researcher (ORCID 0000-0003-2639-7504) |
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| yuta amagai researcher |
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| yasutaka amagai researcher |
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| takashi amagai researcher |
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| yumiko amagai researcher |
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| mitsuhiro amagai |
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| masayuki amagai researcher |
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