Cognomen Gorostarzu (Gorostarzu 
) , worldwide, is a rare surname. The last name Gorostarzu is characteristic of Argentina, where it is a rare surname, France, where it is a very rare surname, and Spain. Much less frequently, Gorostarzu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gorostarzu | France, Argentina, Spain, Brazil, United States |
| andré de gorostarzu FR (b. 1899) |
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patricia de gorostarzu French photographer, FR (b. 1962) |
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| maiten de gorostarzu (born 1934) (b. 1934) |
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| bertrand de gorostarzu FR (b. 1927) |
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| ione gorostarzu Basque writer, ES (b. 1984) |
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Stã, Edgar, Hilda, Flora, Martin, Maylis, Monica, Miguel, Sandra, Silvia, Susana, Alicia, Andrea, Arturo, Aroldo, Amalia, Chloé, Carlos, Blanca, Ramona, Liloie, Nelida, Nancy, Jorge, Lucia, Louis, Paul, Dora, Jose, Juan, Elsa, Elba, Hugo, Irma, Omar, Maria, Nestor, Mario, Aitor, Carla, Craig, Pedro, Delia, Diego, Dimas, Gilda, Laura, Laure, Sonia, and Emilia