Cognomen Barreau (Barou 
, بارو 
, Barreau 
) , globally, is a common last name. The family name Barreau is habitual in Seychelles, where it is quite a common surname, France, and Haiti, where it is quite a rare surname. In absolute terms, it most frequently occurs in France, Ivory Coast, and Haiti. Very seldom, Barreau is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Barou | Morocco, Mali, France, Ivory Coast, United States |
| بارو | Egypt, Sudan, Syria, Iraq, Saudi Arabia |
| Barreau | Morocco, France, Haiti, United States, Madagascar |
| Барро | Russia, Ukraine |
| françois barreau French sculptor of the 18th century specialised in turned wood, FR (b. 1731) |
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| louis barreau de la touche FR (b. 1758) |
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| rose-alexandrine barreau French female soldier, FR (b. 1771) |
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| léonard michelon du mas barreau French politician, FR (b. 1815) |
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gaston barreau French footballer (1883-1958), FR (b. 1883) |
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| arthur hamptonne barreau (b. 1879) |
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| marcel barreau French politician (1898-1956), FR (b. 1898) |
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| edmond barreau FR (b. 1903) |
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catherine barreau Belgian writer, BE (b. 1965) |
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| andré barreau French tapestry weaver, FR (b. 1918) |
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| jacques barreau association football player (b. 1923) |
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andre barreau British musician, GB |
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| jean-claude barreau French essayist, FR (b. 1933) |
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| maurice barreau French association football player, FR (b. 1939) |
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| hervé barreau (b. 1929) |
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