Cognomen Demetrias (Demetrias 
) , in the entire world, is an extremely rare last name. The last name Demetrias is characteristic of New Zealand, where it is a very rare surname, Spain, where it is an extremely rare surname, and the United States. Much more frequently, Demetrias is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demetrias | United Kingdom, United States, South Africa, New Zealand, India |
|
marcia aurelia ceionia demetrias mistress of Roman emperor Commodus, IT (b. 200) |
|
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