Surname Ostolaza (Ostolaza 
) , all over the world, is quite a rare family name. The surname Ostolaza is habitual in Latin America and the Caribbean, particularly Puerto Rico, where it is quite a rare surname, Peru, and Bolivia. Not in comparison with a country's population, it most frequently occurs in Peru, Puerto Rico, and the United States. Very seldom, Ostolaza is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ostolaza | Argentina, Peru, Puerto Rico, United States, Spain |
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blas gregorio ostolaza y ríos Spanish politician, ES (b. 1771) |
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| jose manuel ostolaza Basque american hat maker, ES (b. 1875) |
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carlos ostolaza botanist, PE (b. 1936) |
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| maría ostolaza Peruvian volleyball player, PE (b. 1953) |
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| agustín ostolaza etxaniz ES (b. 1946) |
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| santiago ostolaza Uruguayan footballer, UY (b. 1962) |
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udane ostolaza ES |
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| laurence ostolaza French journalist, FR (b. 1967) |
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| euken ostolaza ES (b. 1961) |
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| ainhoa ostolaza Spanish cyclist, ES (b. 1973) |
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| margarita ostolaza Puerto Rican politician, US |
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| daniel carballo ostolaza researcher |
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| helena ostolaza researcher |
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| joseba ostolaza ES (b. 1973) |
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| jon juaristi ostolaza ES (b. 1981) |
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