Last name Гаыко (Gayko 
, Гаыко 
) , throughout the world, is a rare family name. The surname Гаыко is characteristic of Germany, where it is a rare surname, Spain, where it is a very rare surname, and Australia. Not in comparison with a country's population, it is commonest in Germany, Russia, and Spain.
| VARIANT | COUNTRY |
|---|---|
| Gayko | Germany, Spain, Australia, United States, India |
| Гаыко | Russia |