Cognomen Rioca (Rioca 
) , throughout the world, is a very rare last name. The cognomen Rioca is habitual in Philippines, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Rioca is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rioca | United States, Philippines, India |