Last name Szczesniak (Szczesniak 
, Szcześniak ) , in all the world, is quite a common cognomen. The last name Szczesniak is habitual in Poland, where it is quite a common surname, Ireland, where it is a rare surname, and the United States. Measured by absolute frequency, this name is the most popular in Poland, the United States, and Germany. Likewise, Szczesniak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Szcześniak, Szczesniak | Germany, France, Poland, United Kingdom, United States |
Szczęsniak, and Szczęśniak
| tom szczesniak American composer and musician, US (b. 1948) |
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| dorota szczesniak researcher |
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| michal szczesniak researcher |
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| rhonda d szczesniak researcher |
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| laura m szczesniak researcher |
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| michal szczesniak (b. 1982) |
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