Family name Külvik (Külvik 
) , in all the world, is an extremely rare surname. The cognomen Külvik is characteristic of Northern Europe, particularly Estonia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Külvik | Estonia |
| mart külvik Estonian geographer and biologist, EE (b. 1960) |
|
|
| jüri külvik (b. 1965) |
|