Cognomen Ronald Demetrio (Ronald Demetrio 
) , in all the world, is an extremely rare last name. The cognomen Ronald Demetrio is characteristic of Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. Much more frequently, Ronald Demetrio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ronald Demetrio | Peru, Ecuador, Chile |