Cognomen Four (Fo 
, Four 
, Фур 
) , throughout the world, is a common last name. The cognomen Four is habitual in Maldives, where it is a common surname, Andorra, where it is quite a common surname, and Suriname. In absolute terms, the name is most common in Algeria, Indonesia, and France. Likewise, Four is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fo | France, Egypt, India, Indonesia, Algeria |
| Four | France, India, Indonesia, China, Algeria |
| Фур | Kazakhstan, Ukraine, Russia, Kyrgyzstan |
| henri du four (b. 1550) |
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| françois du four industrialist, BE (b. 1871) |
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michel four French painter, FR (b. 1945) |
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| claudius four French military personnel, FR (b. 1895) |
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four tet British musician and DJ, GB (b. 1977) |
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| four arrows writer and professor, US (b. 1946) |
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meta four SE (b. 1987) |
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| paul four modern pentathlete, FR (b. 1956) |
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| chantal four French politician, FR (b. 1962) |
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| frank de four BE (b. 1955) |
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| jean-marc four French journalist, FR (b. 1966) |
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| béatrice four French politician, FR (b. 1973) |
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| christine four French politician, FR (b. 1974) |
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| olivier four French motorcycle racer, FR |
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| stephanie du four researcher (ORCID 0000-0002-9406-2274) |
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