Surname 俊一 (俊一 
, Shunichi 
, Shun-Ichi 
) , around the world, is quite a rare cognomen. The cognomen 俊一 is characteristic of Japan, where it is quite a rare surname, China, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Also, 俊一 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 俊一 | China |
| Shunichi | China, United States, Mongolia, Japan, Myanmar |
| Shun-Ichi | Japan, Canada |
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棟居 俊一 JP (b. 1893) |
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川野 俊一 Japanese freestyle wrestler (1936-2009), JP (b. 1936) |
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| 永尾 俊一 Japanese businessperson, JP (b. 1963) |
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| 加治佐 俊一 JP (b. 1959) |
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