Cognomen Margarita Ernestina (Margarita Ernestina 
) , globally, is a very rare last name. The surname Margarita Ernestina is habitual in Latin America and the Caribbean, particularly Chile, where it is a rare surname. More frequently, Margarita Ernestina is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Margarita Ernestina | Spain, Mexico, Chile, Ecuador, Peru |