Family name Ruíz Díaz (Ruíz Díaz 
) , all over the world, is a very rare cognomen. The last name Ruíz Díaz is habitual in Latin America and the Caribbean, particularly Uruguay, where it is a rare surname, and Argentina, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ruíz Díaz | Uruguay, Argentina |