Throughout the world, Santiago Demetrio (Santiago Demetrio 
) is a very rare boy's first name. The first name Santiago Demetrio is habitual in Latin America and the Caribbean, particularly Peru, where it is a very rare masculine name. Very seldom, Santiago Demetrio is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Santiago Demetrio | Peru, Chile, Ecuador |