Cognomen Boutkous (Boutkous 
, Буткус 
) , throughout the world, is a rare surname. The cognomen Boutkous is characteristic of Eastern Europe, particularly Belarus, where it is a rare surname, Ukraine, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Boutkous | Canada, Russia |
| Буткус | Kazakhstan, Russia, Ukraine, Belarus |