Around the world, Riuka (Riuka 
) is a very rare epicene forename. The forename Riuka is habitual in Romania, where it is a rare masculine name, and the United States, where it is an extremely rare girly name. Also, Riuka is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Riuka | Romania, Nigeria, United States, India, Lithuania |