Cognomen Usandizaga (Usandizaga 
) , all over the world, is a rare family name. The cognomen Usandizaga is habitual in Argentina, where it is a rare surname, Spain, and France, where it is a very rare surname. In absolute terms, it is the most numerous in Argentina, Spain, and Brazil. Much less frequently, Usandizaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Usandizaga | Brazil, Argentina, France, Mexico, Spain |
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josé maría usandizaga Spanish composer (1887-1915), ES (b. 1887) |
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horacio usandizaga Argentine politician, AR (b. 1940) |
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| ramón usandizaga ES (b. 1889) |
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| maría josé usandizaga rodríguez Spanish politician, ES (b. 1951) |
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| aránzazu usandizaga (b. 1943) |
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| miguel usandizaga Spanish architect, ES (b. 1954) |
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| helena usandizaga (b. 1947) |
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| sofía usandizaga Argentine sailor, AR (b. 1970) |
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| sara usandizaga researcher |
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| federico usandizaga AR (b. 1971) |
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| aintzane usandizaga Spanish writer, ES (b. 1988) |
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Mr, Marã, Mayte, Mabel, Miren, Mikel, Sarah, Sofia, Alona, Aloã, Andre, Ariel, Amaia, Aitor, Clara, Borja, Bruno, Paulo, Pablo, Pedro, Ramon, Diana, Marta, Maria, Yuri, Omar, Ms, Ana, Paz, Jon, Eva, Iã, Manu, Sara, Coro, Dora, Diego, Luis, Jose, Joao, Juan, Tais, Elsa, Hugo, Viru, Irma, Ibai, Igor, Luiz, and Dilia