Surname Šlapak (Шлапак 
, Šlapak 
) , throughout the world, is quite a common cognomen. The surname Šlapak is habitual in Eastern Europe, particularly Ukraine, where it is quite a rare surname, Belarus, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Шлапак | Ukraine, Kazakhstan, Russia, Belarus, Poland |
| Šlapak | Croatia |