Surname Oltra (Oltra 
) , in all the world, is quite a rare cognomen. The cognomen Oltra is habitual in Spain, where it is quite a rare surname, France, where it is a rare surname, and Argentina. In absolute terms, it is the most numerous in Spain, France, and Mexico. Likewise, Oltra is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Oltra | Argentina, France, Mexico, Venezuela, Spain |
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manuel oltra Spanish composer (1922-2015), ES (b. 1922) |
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| lorenzo criado oltra Spanish architect (b. 1894) |
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silvio oltra Argentine racing driver, AR (b. 1958) |
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mónica oltra jarque Spanish lawyer and politician, ES (b. 1969) |
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josé luis oltra Spanish footballer and manager, ES (b. 1969) |
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| enrique oltra molto Spanish politician, ES (b. 1921) |
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| miguel oltra ES (b. 1911) |
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ariadna oltra Spanish journalist, ES (b. 1979) |
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| benjamín oltra (b. 1945) |
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| rosa balaguer oltra Valencian journalist, ES (b. 1956) |
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| maría oltra Spanish politician, ES (b. 1963) |
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| coco oltra NL (b. 1956) |
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| silvestre oltra researcher |
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| miguel oltra botanist |
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| maria oltra researcher (ORCID 0000-0001-6397-2702) |
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