Family name Zhadeiko (Zhadeiko 
, Жадейко 
) , around the world, is a rare cognomen. The family name Zhadeiko is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Russia, where it is a very rare surname, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Zhadeiko | Russia, Belarus |
| Жадейко | Kazakhstan, Russia, Ukraine, Belarus |