Surname Gaztelu (Gaztelu 
) , globally, is a rare cognomen. The cognomen Gaztelu is habitual in Spain, where it is a rare surname, Argentina, and Norway, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Spain, Argentina, and France. Much less frequently, Gaztelu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gaztelu | Norway, Spain, United States, Argentina, France |
| domingo de gaztelu (b. 1515) |
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| fernando de aguirre gaztelu ES (b. 1811) |
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| luis gaztelu Spanish author, ES (b. 1858) |
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| angel gaztelu Cuban catholic priest and poet (1914-2003), CU (b. 1914) |
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| josé calderón gaztelu (b. 1904) |
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| elixabete perez gaztelu ES (b. 1961) |
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| izaskun gaztelu Spanish footballer, ES (b. 1974) |
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| iñigo pomposo gaztelu researcher |
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| blanca elío y de gaztelu |
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| josé gaztelu |
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Ana, Leyre, Lorea, Lucas, Jaime, José, Josã, Jorge, Tomas, Noemi, Nelda, Elena, Erica, Oscar, Marcia, Maider, Monica, Miriam, Miguel, Sandra, Silvia, Sergio, Laura, Digna, Ramon, Pedro, Lui, Jon, Iã, Jose, Juan, Tato, Elda, Iker, Maria, Mario, Ainhoa, Marta, Miren, Mirta, Mikel, Ander, Amaia, Aitor, Clara, Berta, Koldo, Pablo, Maite, and Carlos