Last name Omercia (Omercia 
) , all over the world, is an extremely rare cognomen. The surname Omercia is habitual in Latin America and the Caribbean, particularly Venezuela, where it is an extremely rare surname. Much more frequently, Omercia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Omercia | Venezuela, Brazil, Democratic Republic of the Congo |