Cognomen Bareiro (Bareiro 
) , across the world, is a common surname. The cognomen Bareiro is habitual in Latin America and the Caribbean, particularly Paraguay, where it is a common surname, Argentina, where it is quite a common surname, and Uruguay, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Latin America and the Caribbean, particularly Paraguay, Argentina, and Brazil.
| VARIANT | COUNTRY |
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| Bareiro | Paraguay, Spain, Uruguay, Brazil, Argentina |
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cándido bareiro President of Paraguay (1833-1880), PY (b. 1833) |
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line bareiro Paraguayan political scientist, PY (b. 1950) |
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| carlos lara bareiro Paragauyan musician, PY (b. 1914) |
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| luciano rosano bareiro Uruguayan writer, UY (b. 1920) |
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fredy bareiro Paraguayan Footballer, PY (b. 1982) |
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| orlando bareiro footballer, PY (b. 1978) |
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| ramón bareiro footballer, AR |
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| néstor bareiro Paraguayan footballer, PY (b. 1983) |
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| antonio bareiro Paraguayan association football player, PY (b. 1989) |
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| mariano bareiro Argentinian-Isareli association footballer, AR (b. 1995) |
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| adam bareiro Paraguayan association football player, PY (b. 1996) |
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| diego bareiro Paraguayan basketball player, PY (b. 1997) |
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| sergio bareiro Paraguayan footballer, PY (b. 1998) |
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| daysy bareiro Paraguayan footballer, PY |
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