Family name Petaja (Petaja 
) , all around the world, is a rare surname. The last name Petaja is habitual in Finland, where it is quite a rare surname, Estonia, where it is a rare surname, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Petaja | Estonia, Finland, United States, India, Canada |
|
emil petaja American writer, US (b. 1915) |
|
| liidia petaja Estonian engineer, EE (b. 1938) |
|
Mr, Chris, Brown, Karin, Karie, Kelly, Regee, Della, Detia, David, James, Jason, Jussi, Nancy, Niola, Holly, Marsha, Maggie, Mckrai, Saskia, Sumana, Brenda, Adele, Anton, Susan, Sarah, Ms, Ben, Ron, Tom, Nye, Mary, Matt, Alan, Kyle, Paul, Brooke, Dean, Guna, Glen, Jane, John, Jean, Jeff, Tony, Eric, Hans, Mindy, Gary, and Karlyn