Family name Nieczaj (Nieczaj 
) , all over the world, is a rare last name. The surname Nieczaj is characteristic of Poland, where it is a rare surname, Argentina, where it is a very rare surname, and Germany, where it is an extremely rare surname. Also, Nieczaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nieczaj | Germany, United States, Poland, Argentina, Brazil |
| mikołaj nieczaj PL (b. 1818) |
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| rolf nieczaj (b. 1956) |
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| iwan nieczaj |
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