Throughout the world, Oneira (Oneira 
) is a very rare female forename. The forename Oneira is habitual in Latin America and the Caribbean, particularly Colombia, where it is a very rare feminine name, and Mexico. Likewise, Oneira is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Oneira | United States, Mexico, Venezuela, Colombia, Spain |