Around the world, 俊一 (俊一 
, Shunichi 
, Shun-Ichi 
) is quite a rare dominantly masculine, but seldom female forename. The first name 俊一 is habitual in Japan, where it is a rare boy's name, China, where it is a rare mostly boy's, but uncommonly girly name, and the United States, where it is an extremely rare predominantly boy's, but very seldom female name. Likewise, 俊一 is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| 俊一 | China |
| Shunichi | Japan, China, United States, Myanmar, Mongolia |
| Shun-Ichi | Canada, Japan |
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江間俊一 Japanese lawyer, JP (b. 1861) |
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島邨俊一 JP (b. 1862) |
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吉良俊一 Japanese military personnel, JP (b. 1889) |
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加瀬 俊一 Japanese diplomat (1897-1956), JP (b. 1897) |
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天知俊一 baseball manager, JP (b. 1903) |
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鈴木俊一 Governor of Tokyo, JP (b. 1910) |
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| 天沼俊一 Japanese historian (1876-1947), JP (b. 1876) |
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岩崎俊一 Japanese scientist, JP (b. 1926) |
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上野俊一 entomologist, JP (b. 1930) |
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甘利俊一 Japanese engineer, JP (b. 1936) |
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田中俊一 Japanese physicist, JP (b. 1945) |
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| 川崎俊一 Japanese astronomer, JP (b. 1896) |
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| 松本俊一 Japanese diplomat, JP (b. 1897) |
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都倉 俊一 Japanese composer and music arranger, JP (b. 1948) |
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山口俊一 Japanese politician, JP (b. 1950) |
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