Last name Loizaga (Loizaga 
) , around the world, is a rare cognomen. The family name Loizaga is habitual in Argentina, where it is quite a rare surname, Spain, where it is a rare surname, and Venezuela, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Argentina, Spain, and Mexico. Very seldom, Loizaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Loizaga | Spain, Mexico, United States, Argentina, Venezuela |
| carlos loizaga Paraguayan politician, PY (b. 1801) |
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| emiliano olano loizaga ES (b. 1850) |
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eladio loizaga Paraguayan diplomat, PY (b. 1949) |
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| josé maría loizaga viguri Spanish businessman, ES (b. 1936) |
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| saturnino ruiz de loizaga (b. 1939) |
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| arantxa loizaga Mexican journalist, MX (b. 1983) |
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| jone loizaga ES (b. 1983) |
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| ismael ruiz de loizaga ES (b. 1983) |
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Mr, Facu, Ines, Olga, Omar, Yeny, Unai, Maria, Mario, Marta, Marco, Marã, Maite, Mavel, Miren, Mikel, Sonia, Sofia, Alejo, Ander, Angel, Ariel, Hugo, Emma, Enzo, Eloy, Mã, Mª, Ana, Luz, Jon, Iã, Manu, Melo, Sara, Aida, Amaya, Raul, Rene, Rita, Dora, Luis, Jose, Josu, Jone, Juan, Elsa, Elba, Rosa, and Amaia