Cognomen Kubko (Kubko 
) , in the world, is a very rare surname. The family name Kubko is characteristic of Slovakia, where it is a rare surname, Israel, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Slovakia, the United States, and Russia. Also, Kubko is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kubko | Canada, Slovakia, Russia, United States, Israel |