Family name Mercedes Lastenia (Mercedes Lastenia 
) , in the entire world, is an extremely rare last name. The cognomen Mercedes Lastenia is characteristic of Latin America and the Caribbean, particularly Chile, where it is a very rare surname. Much more prevalently, Mercedes Lastenia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mercedes Lastenia | Ecuador, Chile, Peru |