Family name Niewczas (Niewczas 
) , all over the world, is quite a rare surname. The last name Niewczas is characteristic of Poland, where it is quite a rare surname, Lithuania, where it is a rare surname, and Germany, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Poland, Germany, and Italy. Also, Niewczas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Niewczas | United States, Poland, Germany, Italy, Canada |
| andrzej niewczas (b. 1947) |
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| marta niewczas Polish sportsperson, PL (b. 1974) |
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| monika a niewczas researcher |
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| marek niewczas researcher (ORCID 0000-0002-8529-7194) |
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| julia niewczas researcher (ORCID 0000-0003-1627-4316) |
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| niewczas marta researcher (ORCID 0000-0002-2687-3243) |
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| agata niewczas researcher (ORCID 0000-0002-8003-5638), PL |
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| pawel niewczas researcher |
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