Last name Железняк (Железняк 
, Zhelezniak 
, Zheleznyak 
) , in all the world, is a common cognomen. The last name Железняк is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Russia.
| VARIANT | COUNTRY |
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| Железняк | Ukraine, Belarus, Russia, Kyrgyzstan, Kazakhstan |
| Zhelezniak | Ukraine, United States, Russia |
| Zheleznyak | Belarus, Ukraine, Russia, Albania, United States |
| Zeleneac | Spain |
Jelezniak, Zheleznjak, Zhelyeznyak, and Železnjak
| железняк, николай кондратьевич Soviet journalist (1888-1950), UA (b. 1888) |
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| железняк омелян савелійович painter (1909-1963), UA (b. 1909) |
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железняк микола григорович UA (b. 1960) |
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железняк, сергей владимирович Russian politician, RU (b. 1970) |
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| железняк йосип аронович UA (b. 1918) |
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| железняк, григорий карпович RU (b. 1928) |
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ярослав іванович железняк Ukrainian politician, UA (b. 1989) |
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| железняк сергій сергійович UA (b. 1930) |
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| железняк, яков ильич Soviet sport shooter, UA (b. 1941) |
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| железняк георгій васильович UA (b. 1939) |
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| железняк, владимир николаевич Russian philosopher, RU (b. 1951) |
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| железняк леонід леонідович UA (b. 1942) |
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| железняк, николай александрович Russian writer, RU (b. 1964) |
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| олеся владимировна железняк Russian actress, RU (b. 1974) |
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| железняк, александр дмитриевич RU (b. 1966) |
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