Cognomen Дайн (Dain 
, Dayn 
, Дайн 
) , in the entire world, is quite a common family name. The last name Дайн is characteristic of South Korea, where it is quite a rare surname, Malaysia, and Myanmar. Not in comparison with a country's population, this name is the most popular in Pakistan, South Korea, and India. Likewise, Дайн is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dain | South Korea, United States, India, Pakistan, Myanmar |
| Dayn | Morocco, Australia, Philippines, United States, India |
| Дайн | Kazakhstan, Russia, Ukraine |
| Dajn | India, United States |