Cognomen Oreiro (Oreiro 
, Орейро 
) , around the globe, is quite a rare family name. The cognomen Oreiro is habitual in Uruguay, where it is quite a rare surname, Philippines, and United Arab Emirates, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Philippines, Spain, and Argentina. Very seldom, Oreiro is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oreiro | Brazil, United States, Spain, Argentina, Philippines |
| Орейро | Russia |
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manuela oreiro lema de vega Spanish opera singer, ES (b. 1818) |
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| washington oreiro Uruguayan composer, UY (b. 1917) |
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natalia marisa oreiro iglesias Uruguayan singer and actress, UY (b. 1977) |
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| josé domingo cipriano oreiro Spanish politician, ES (b. 1947) |
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| eula gems oreiro researcher (ORCID 0000-0001-9852-1549) |
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| josé luís da costa oreiro researcher at the University of Brasilia |
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| josé luis oreiro BR |
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