Family name Ελευθέριος (Eleuterio 
, Eleftherios 
, Eleutherios 
) , all around the world, is a widespread last name. The cognomen Ελευθέριος is characteristic of Greece, where it is a common surname, Mexico, where it is quite a common surname, and Spain. Not in comparison with a country's population, it is commonest in Greece, Mexico, and Brazil. Likewise, Ελευθέριος is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Eleuterio | Philippines, Peru, Argentina, Brazil, Mexico |
| Eleftherios | Spain, Peru, Greece, Brazil, Venezuela |
| Eleutherios | Canada, Greece, Italy, United States, Brazil |
| Ελευθέριος | Greece |
Elefterios, Elefthérios, Eleutherius, Elevtherios, Lefteris, Λευτέρης, Лефтерис, and Элефтериос
| επίσκοπος ελευθέριος Greek bishop, GR (b. 1929) |
|
Βενιζέλος, and Δημητριάδης