Cognomen Onetta (Onetta 
) , all over the world, is a rare family name. The family name Onetta is habitual in Brazil, where it is a rare surname, China, where it is an extremely rare surname, and the United States. Also, Onetta is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onetta | Canada, Brazil, Italy, United States, China |