Cognomen Rocius (Rocius 
) , worldwide, is a very rare last name. The last name Rocius is habitual in Lithuania, where it is quite a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. Much less frequently, Rocius is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rocius | United Kingdom, Lithuania, United States, South Africa |
| domas rocius LT (b. 1905) |
|