Surname Oyarzo (Oyarzo 
) , throughout the world, is a common last name. The cognomen Oyarzo is habitual in Latin America and the Caribbean, particularly Chile, where it is quite a common surname, Argentina, where it is quite a rare surname, and Uruguay, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Chile, Argentina, and the United States.
| VARIANT | COUNTRY |
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| Oyarzo | Uruguay, Sweden, Argentina, Chile, United States |
| cesar oyarzo Chilean economist, CL (b. 1901) |
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| gumercindo oyarzo CL (b. 1892) |
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fidel oyarzo Chilean journalist, CL (b. 1961) |
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rubén oyarzo CL (b. 1980) |
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| claudio oyarzo Swedish musician, SE (b. 1979) |
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| juan oyarzo researcher |
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| juan fernando oyarzo researcher (ORCID 0000-0002-3830-3547) |
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| claudio oyarzo researcher (ORCID 0000-0001-7240-1928) |
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