Cognomen Petroso (Petroso 
) , across the world, is a very rare surname. The family name Petroso is characteristic of Italy, where it is a rare surname, Brazil, where it is an extremely rare surname, and the United Kingdom. Measured by absolute frequency, it is commonest in Italy, Brazil, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Petroso | Brazil, United States, United Kingdom, Italy |