Around the globe, Sonia Ernestina (Sonia Ernestina 
) is a very rare feminine forename. The first name Sonia Ernestina is characteristic of Latin America and the Caribbean, particularly Chile, where it is a rare female name, and Peru, where it is a very rare female name. Very seldom, Sonia Ernestina is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sonia Ernestina | Mexico, Peru, Chile, Ecuador |