Cognomen Onaro (Onaro 
) , throughout the world, is a rare surname. The family name Onaro is characteristic of Philippines, where it is a rare surname, Nigeria, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, Onaro is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onaro | United States, Philippines, United Kingdom, Nigeria |