Cognomen Rio (Rio 
, Riu , リオ 
, among others...) , all over the world, is a widespread surname. The family name Rio is habitual in Portugal, where it is quite a common surname, Andorra, and Japan (explore the name in all countries). In absolute terms, it most frequently occurs in Indonesia, Japan, and Philippines. Likewise, Rio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Riu, Rio | Spain, France, Indonesia, Colombia, Philippines |
| リオ | Japan |
| ريو | Algeria, Syria, Sudan, Iraq, Saudi Arabia |
| Рио | Russia, Kazakhstan |
| ריו | Israel |
| nicolò da rio (b. 1310) |
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| martim de castro do rio (b. 1548) |
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| manuel del rio (1690-1766) (b. 1690) |
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manuel alves do rio PT (b. 1777) |
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| nicolò da rio author (1756-1845), IT (b. 1756) |
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emmanuel rio Brazilian slave sent to Vienna around 1820, working as a gardener at the court of Francis I of Austria, BR (b. 1810) |
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| josef giannatassio del rio (1770-1836), AT (b. 1770) |
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| niccolò da rio IT (b. 1765) |
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| juan de dios vial del rio Chilean judge and politician, CL (b. 1779) |
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| alexis-françois rio French art historian (1797-1874), FR (b. 1797) |
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| jean rio (1810-1883) (b. 1810) |
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jose mora y del rio MX (b. 1854) |
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alphonse rio French politician (1873-1949), FR (b. 1873) |
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| françois rio French politician, FR (b. 1829) |
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josé pires do rio Brazilian politician, BR (b. 1880) |
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