Family name Гаыденко (Гаыденко 
, Gaydenko 
) , in the entire world, is a very rare cognomen. The cognomen Гаыденко is habitual in Estonia, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Гаыденко | Russia |
| Gaydenko | Ukraine, Russia, Estonia, United States |