Cognomen Erquiaga (Erquiaga 
) , all over the world, is a rare last name. The surname Erquiaga is habitual in Argentina, where it is a rare surname, Peru, and Spain. Measured by absolute frequency, it is commonest in Argentina, the United States, and Peru. Very seldom, Erquiaga is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Erquiaga | Argentina, Peru, Philippines, United States, Spain |
| chichita de erquiaga Argentine television presenter, AR (b. 1931) |
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| iván erquiaga Argentine association football player, AR (b. 1998) |
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