Cognomen Ratajczak (Ratajczak 
, Ратайчак 
) , all over the world, is a common family name. The cognomen Ratajczak is characteristic of Poland, where it is quite a common surname, Germany, where it is quite a rare surname, and France. Measured by absolute frequency, it is the most numerous in Poland, Germany, and the United States. Also, Ratajczak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratajczak | Germany, France, Poland, United Kingdom, United States |
| Ратайчак | Ukraine |
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józef ratajczak Major of Polish Army, PL (b. 1897) |
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franciszek ratajczak PL (b. 1887) |
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marek ratajczak Polish economist, PL (b. 1954) |
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janusz ratajczak Polish opera singer (tenor) and teacher, PL (b. 1962) |
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| antoni ratajczak PL (b. 1903) |
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| teofil ratajczak PL (b. 1908) |
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leszek ratajczak (b. 1968) |
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| janusz ratajczak Polish sportsperson and athletics competitor, PL (b. 1929) |
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łukasz ratajczak Polish opera singer (tenor) and teacher, PL |
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kevin ratajczak German singer, DE |
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| klemens ratajczak (b. 1921) |
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| henryk ratajczak Polish chemist, PL (b. 1932) |
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michael ratajczak German footballer, DE (b. 1982) |
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| józef ratajczak Polish poet, PL (b. 1932) |
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| zygmunt ratajczak PL (b. 1924) |
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