Cognomen Sadaunykas (Sadaunykas 
) , throughout the world, is a very rare surname. The surname Sadaunykas is characteristic of Northern Europe, particularly Lithuania, where it is quite a rare surname, and Estonia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sadaunykas | Estonia, Lithuania |
| jonas sadaunykas Lithuanian writer, LT (b. 1925) |
|