Surname Jonczyk (Jonczyk 
) , globally, is quite a rare cognomen. The family name Jonczyk is habitual in Poland, where it is quite a rare surname, Germany, where it is a rare surname, and Switzerland. Measured by absolute frequency, it most frequently occurs in Poland, Germany, and the United States. More frequently, Jonczyk is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jonczyk | Germany, United Kingdom, United States, Poland, Brazil |
| julian o. jonczyk PL (b. 1930) |
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| krzysztof jonczyk (b. 1956) |
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| michael jonczyk researcher (ORCID 0000-0003-2507-6813) |
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| magda s jonczyk researcher |
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| martin jonczyk researcher |
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| piotr jonczyk researcher, PL |
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| michał jonczyk Polish footballer, PL (b. 1992) |
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