Cognomen Rosario Otilia (Rosario Otilia 
) , in the entire world, is an extremely rare surname. The family name Rosario Otilia is habitual in Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. Much more frequently, Rosario Otilia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rosario Otilia | Peru, Spain, Ecuador, Chile |