Cognomen Vlassios (Vlassios 
) , across the world, is a very rare last name. The family name Vlassios is habitual in Greece, where it is a rare surname, and France, where it is an extremely rare surname. More frequently, Vlassios is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vlassios | United Kingdom, Greece, France, Germany, United States |