Surname Saiun (Saiun 
, Саюн 
) , in all the world, is a rare family name. The cognomen Saiun is characteristic of Ukraine, where it is a rare surname, Indonesia, and Malaysia. Likewise, Saiun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Saiun | Japan, Thailand, Malaysia, Indonesia, India |
| Саюн | Kazakhstan, Russia, Kyrgyzstan, Ukraine |