Family name Mejillas (Mejillas 
) , worldwide, is a very rare last name. The cognomen Mejillas is characteristic of Nicaragua, where it is a very rare surname, Mexico, where it is an extremely rare surname, and the United States. In absolute terms, the name is most common in the United States, Mexico, and Spain.
| VARIANT | COUNTRY |
|---|---|
| Mejillas | Nicaragua, Mexico, United States, Spain |