In the entire world, Marcos Isaias (Marcos Isaias 
) is a rare boy's forename. The first name Marcos Isaias is habitual in Latin America and the Caribbean, particularly Chile, where it is a rare male name, and Peru. Much less frequently, Marcos Isaias is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Marcos Isaias | Peru, Ecuador, Chile, Argentina |