Cognomen Olascoaga (Olascoaga 
) , all over the world, is quite a rare family name. The family name Olascoaga is habitual in Latin America and the Caribbean, particularly Uruguay, where it is quite a rare surname, Mexico, and Peru. Not in comparison with a country's population, this name is the most popular in Latin America and the Caribbean, particularly Mexico, Colombia, and Peru. Much less frequently, Olascoaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Olascoaga | Uruguay, Colombia, Mexico, United States, Peru |
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manuel josé olascoaga Argentinian politician, AR (b. 1835) |
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| octavio olascoaga Argentinian military personnel, AR (b. 1842) |
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| ramón de olascoaga (b. 1864) |
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| mercedes iridoy olascoaga Spanish politician, ES (b. 1924) |
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| raúl casas olascoaga Uruguayan writer, UY (b. 1926) |
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| ariel olascoaga Uruguayan basketball player, UY (b. 1929) |
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| josé luis lópez olascoaga (b. 1964) |
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| diego martínez olascoaga Uruguayan writer, UY |
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| m j olascoaga researcher |
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| javier olascoaga researcher |
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| estanislao valdés olascoaga UY |
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| luis ernesto olascoaga footballer, MX (b. 1991) |
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| beñat olascoaga researcher |
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