Surname Efefanio (Efefanio 
) , in the entire world, is an extremely rare family name. The last name Efefanio is habitual in Latin America and the Caribbean, particularly Peru, where it is an extremely rare surname. Much more prevalently, Efefanio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Efefanio | Peru, Philippines |