Cognomen Pejn (Pejn 
, Пейн 
) , around the world, is a very rare family name. The surname Pejn is habitual in Bulgaria, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Russia. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Russia, Bulgaria, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Pejn | United Kingdom |
| Пейн | Ukraine, Russia, Bulgaria, Kyrgyzstan |