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