Last name Koscielniak (Koscielniak 
) , in all the world, is quite a rare family name. The family name Koscielniak is characteristic of Poland, where it is quite a rare surname, Czechia, where it is a rare surname, and Sweden. In absolute terms, it is the most numerous in Poland, the United States, and France. More frequently, Koscielniak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koscielniak | Germany, Czechia, United States, Poland, France |
| hélène koscielniak Canadian novelist, CA (b. 1953) |
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| bruce koscielniak (b. 1947) |
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| jean-pierre koscielniak French historian and writer, FR (b. 1967) |
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| ewa koscielniak researcher |
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| gertrud koscielniak |
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| mieczyslaw koscielniak |
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| michalina koscielniak German model, DE |
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