Cognomen Zaldo (Zaldo 
) , in the entire world, is a rare last name. The cognomen Zaldo is habitual in Spain, where it is a rare surname, Argentina, and Mexico. Not in comparison with a country's population, this name is the most popular in Mexico, Spain, and Philippines. Also, Zaldo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Zaldo | Mexico, Argentina, Philippines, United States, Spain |
| josé zaldo mayor of Ponce, Puerto Rico (b. 1795) |
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bruno zaldo ES (b. 1836) |
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| fernando saíz zaldo Ph.D. Universidad de Valladolid 1976 |
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| carlos zaldo researcher |
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