Cognomen Kostjuks (Kostjuks 
) , in all the world, is a very rare surname. The cognomen Kostjuks is characteristic of Northern Europe, particularly Latvia, where it is quite a rare surname, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kostjuks | United Kingdom, Latvia |
| andrejs kostjuks Latvian association football player, LV (b. 1988) |
|