Family name Руидиас (Руидиас, Ruidíaz 
) , globally, is a very rare cognomen. The surname Руидиас is habitual in Latin America and the Caribbean, particularly Colombia, where it is a very rare surname, Chile, and Peru, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ruidíaz | Spain, Chile, Colombia, Argentina, Peru |