Cognomen Луциус (Lucius 
, Луциус 
) , in the world, is quite a common family name. The cognomen Луциус is habitual in Luxembourg, where it is quite a common surname, Haiti, where it is quite a rare surname, and Germany. Not in comparison with a country's population, it is the most numerous in the United States, Nigeria, and Germany. Also, Луциус is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lucius | Germany, Indonesia, Nigeria, United States, Tanzania |
| Луциус | Kazakhstan, Russia |