Cognomen Dieu-Mercia-Maria (Dieu-Mercia-Maria 
) , worldwide, is an extremely rare family name. Much more prevalently, Dieu-Mercia-Maria is the forename as well as the last name. Parts of the name also exists independently as a first name Dieu, a first name Mercia, and a first name Maria.
| VARIANT | COUNTRY |
|---|---|
| Dieu-Mercia-Maria | Democratic Republic of the Congo |