Family name Petsi (Petsi 
) , throughout the world, is a rare cognomen. The cognomen Petsi is characteristic of Greece, where it is quite a rare surname, Estonia, and Thailand, where it is an extremely rare surname. Likewise, Petsi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Petsi | Estonia, India, Greece, Thailand, South Africa |