Family name Ruiz-Diaz (Ruiz-Diaz 
) , worldwide, is quite a rare cognomen. The last name Ruiz-Diaz is characteristic of Argentina, where it is quite a rare surname, Bolivia, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Argentina, Bolivia, and the United States. Parts of the name also exists independently as a last name Ruiz, and a last name Diaz.
Ana, Elsa, Elva, Elba, Hugo, Iris, Irma, Ilda, Ibir, Olga, Omar, Maria, Mario, Marta, Magin, Mabel, Mirta, Mirna, Santa, Sally, Sixto, Sixta, Elio, Nora, Nira, Tito, Ada, Eva, Sara, Saul, Aldo, Abel, Raul, Rosa, Rita, Rito, Selva, Rudy, Leda, Lina, Lino, Lisa, Lida, Lola, Luis, Jose, Jeni, Juan, Dora, and Sonia