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Cognomen Koyka (Койка
, Koyka
, Коыка
) , in all the world, is a rare surname. The family name Koyka is characteristic of Bulgaria, where it is quite a rare surname, Greece, where it is a rare surname, and Russia, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Eastern Europe, particularly Bulgaria, Russia, and Ukraine. Likewise, Koyka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Койка | Bulgaria, Kazakhstan, Russia, Ukraine |
| Koyka | Spain, India, Greece, Bulgaria, Germany |
| Коыка | Russia |