Family name Mer-Ciel (Mer-Ciel 
) , around the world, is an extremely rare cognomen. Much more frequently, Mer-Ciel is the forename as well as the last name. Parts of the name also exists independently as a first name Mer, and a first name Ciel.
| VARIANT | COUNTRY |
|---|---|
| Mer-Ciel | Democratic Republic of the Congo |