Cognomen Iturrizaga (Iturrizaga 
) , in the world, is quite a rare family name. The cognomen Iturrizaga is characteristic of Peru, where it is quite a rare surname, Spain, where it is a very rare surname, and Chile. In absolute terms, it most frequently occurs in Peru, the United States, and Spain. Much less frequently, Iturrizaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iturrizaga | Peru, Venezuela, Spain, Chile, United States |
| juan antonio falcón iturrizaga Peruvian bishop (1838-1909) (b. 1838) |
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eduardo iturrizaga Venezuelan-Spanish chess grandmaster, VE (b. 1989) |
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| lasafam iturrizaga researcher ORCID ID = 0000-0003-3520-6917 |
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Mr, Nila, Nina, Elsa, Hugo, Flor, Iris, Irma, Ivan, Ivã, Olga, Maria, Marie, Mario, Marco, Mateo, Mabel, Susan, Smith, Caleb, Cesar, Clara, Juan, Jean, Joel, Jose, Max, Ale, Ana, Luz, Jan, Ivi, Mary, Sara, Sira, Alex, Cindy, Aldo, Aida, Paul, Raul, Raã, Rosa, Ruth, Lisa, Loly, Luis, Jana, Andy, and Belen