Cognomen Demtrio (Demtrio 
) , around the globe, is an extremely rare last name. The last name Demtrio is characteristic of Portugal, where it is a very rare surname, and Brazil, where it is an extremely rare surname. More prevalently, Demtrio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demtrio | Portugal, Spain, Philippines, United States, Peru |