Around the world, Tadasu (Tadasu 
) is an extremely rare gender-neutral first name. Very seldom, Tadasu is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Tadasu | Brazil, Japan, China, Israel, United States |
| tadasu takakuwa (b. 1922) |
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| tadasu tokumaru (b. 1928) |
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| tadasu takuma (b. 1938) |
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| tadasu nishi politician |
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| tadasu iizumi researcher |
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| tadasu shin-i researcher |
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| tadasu nozaki researcher |
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| tadasu urashima researcher |
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| aoki tadasu Japanese journalist |
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| tadasu g. suzuki |
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