Surname Gajko (Gajko 
, Гайко 
) , in the world, is quite a rare family name. The surname Gajko is habitual in Belarus, where it is quite a rare surname, Ukraine, and Kazakhstan, where it is a rare surname. In absolute terms, it is commonest in Eastern Europe, particularly Russia, Ukraine, and Belarus. Very seldom, Gajko is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gajko | Slovakia, United States, Poland, Germany, Brazil |
| Гайко | Ukraine, Kazakhstan, Russia, Belarus, Kyrgyzstan |
| marta gajko Polish actress, PL (b. 1977) |
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| marcin gajko PL (b. 1975) |
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