Cognomen Gorostiaga (Gorostiaga 
) , across the world, is quite a rare surname. The surname Gorostiaga is habitual in Latin America and the Caribbean, particularly Paraguay, where it is quite a common surname, Uruguay, where it is quite a rare surname, and Argentina. Measured by absolute frequency, it is commonest in Paraguay, Argentina, and Spain. Much less frequently, Gorostiaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gorostiaga | Paraguay, Argentina, Spain, Bolivia, Uruguay |
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pedro pablo gorostiaga (b. 1783) |
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josé benjamín gorostiaga Argentinian judge and lawyer, AR (b. 1823) |
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alejandro gorostiaga Chilean Army officer, CL (b. 1840) |
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| nemesio lallana y gorostiaga ES (b. 1796) |
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| anbrosio gorostiaga ES (b. 1867) |
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| félix echevarría gorostiaga (b. 1893) |
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| juan gorostiaga French writer (1905-1988), ES (b. 1905) |
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lola gorostiaga Spanish politician, ES (b. 1957) |
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| eulogio gorostiaga ES (b. 1903) |
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| josé gorostiaga Paraguayan basketball player, PY (b. 1930) |
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naroa gorostiaga ES (b. 1970) |
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| pablo gorostiaga politician, ES (b. 1941) |
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| xabier gorostiaga ES (b. 1935) |
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| eduardo gorostiaga Bolivian tennis player, BO (b. 1945) |
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| josé maría gorostiaga phycologist |
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Mr, Rita, Dora, Gaby, Luis, Luiz, Lula, Jose, Josu, Jeff, Juan, Timo, Tito, Nico, Nora, Noel, Elsa, Elva, Elda, Euge, Hugo, Iris, Rosa, Raã, Raul, Rafa, Ms, Lu, Sol, Ana, Ane, Ari, Pia, Jon, Eva, Vã, Irma, Ing, Meli, Miki, Myra, Sara, Saul, Alba, Agus, Akel, Ayde, Cruz, Iã, and Ilda