Last name Guarnizo (Guarnizo 
) , in the entire world, is a common cognomen. The surname Guarnizo is habitual in Latin America and the Caribbean, particularly Colombia, where it is quite a common surname, Peru, where it is quite a rare surname, and Ecuador, where it is a rare surname. Much less frequently, Guarnizo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Guarnizo | Peru, Colombia, Spain, United States, Ecuador |
| luis guarnizo (b. 1950) |
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| alejandro guarnizo researcher ORCID ID = 0000-0002-9678-5601 |
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| nathalie guarnizo researcher |
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| manuel ignacio aguirre guarnizo c. 1730 - c. 1784, ES |
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| angela guarnizo researcher |
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| jose guillermo guarnizo researcher ORCID ID = 0000-0002-8401-4949 |
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| josé enrique guarnizo Colombian journalist, CO (b. 1980) |
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| carlos e. guarnizo researcher |
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| rocio parrado guarnizo Colombian cyclist, CO (b. 1982) |
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| iván guarnizo |
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