Cognomen Желязко (Желязко 
, Zhelyazko 
, Jeliazko 
) , in the world, is quite a rare family name. The surname Желязко is habitual in Eastern Europe, particularly Bulgaria, where it is quite a common surname, Belarus, where it is a rare surname, and Ukraine. Likewise, Желязко is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Желязко | Kazakhstan, Russia, Belarus, Bulgaria, Ukraine |
| Zhelyazko | Romania, Spain, Bulgaria, Poland, Greece |
| Jeliazko | Canada, United States, United Kingdom, Bulgaria |