Last name Petaisto (Petaisto 
) , in all the world, is a very rare cognomen. The surname Petaisto is habitual in Finland, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, Petaisto is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Petaisto | Finland, United States |