Last name Zeleneac (Железняк 
, Zeleneac 
) , in all the world, is a common cognomen. The surname Zeleneac is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Железняк | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Zeleneac | Spain |