Cognomen Onario (Onario 
) , worldwide, is a very rare surname. The family name Onario is habitual in Philippines, where it is a very rare surname, Honduras, and Mexico, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Philippines, Mexico, and the United States. Also, Onario is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onario | Philippines, Venezuela, Brazil, United States, Mexico |