Last name Basualdo (Basualdo 
) , worldwide, is a common cognomen. The cognomen Basualdo is habitual in Latin America and the Caribbean, particularly Argentina, where it is quite a common surname, Paraguay, and Uruguay, where it is quite a rare surname. In absolute terms, it is commonest in Latin America and the Caribbean, particularly Argentina, Paraguay, and Peru.
| VARIANT | COUNTRY |
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| Basualdo | Peru, Paraguay, Argentina, Bolivia, Uruguay |
| eugenio basualdo (b. 1692) |
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| manuel ortiz basualdo ES (b. 1769) |
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| blas basualdo Argentinian military personnel, AR (b. 1790) |
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luis maría fernández basualdo politician, AR (b. 1948) |
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| eduardo a. ortiz basualdo Argentinian judge (1899-1988), AR (b. 1899) |
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| maria julia basualdo (1911-1993) (b. 1911) |
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josé basualdo Argentine footballer, AR (b. 1963) |
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cristian basualdo Argentinian association football player, AR (b. 1980) |
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alberto vernet basualdo Argentine rugby union footballer, AR (b. 1982) |
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| marta delia de la plaza basualdo (born 1942) (b. 1942) |
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| luis hector sosa basualdo (born 1945) (b. 1945) |
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| eduardo basualdo Argentinian economist and historian, AR (b. 1946) |
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| josé maría basualdo Spanish cyclist, ES (b. 1948) |
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josé basualdo Argentinian handball player, AR |
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| isabel basualdo Paraguayan botanist, PY (b. 1956) |
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