Cognomen Jedrzejczak (Jedrzejczak 
) , throughout the world, is quite a rare surname. The family name Jedrzejczak is habitual in Poland, where it is quite a rare surname, France, where it is a rare surname, and Sweden. Not in comparison with a country's population, it is commonest in Poland, France, and Germany. More frequently, Jedrzejczak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jedrzejczak | United Kingdom, Germany, Poland, United States, France |
| guillaume jedrzejczak (b. 1957) |
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| wiktor jedrzejczak researcher |
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| robert jedrzejczak researcher |
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| jozef jedrzejczak correspondence chess player |
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| piotr jedrzejczak researcher |
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| sophia felicitas jedrzejczak DE (b. 1994) |
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Jan, Czeslaw, Barbara, Ryszard, Dariusz, Grazyna, Jadwiga, Jolanta, Tadeusz, Marianna, Slawomir, Krystyna, Grzegorz, Elzbieta, Wieslawa, Wojciech, Zdzislaw, Zbigniew, Stanislaw, Kazimierz, Kazimiera, Krzysztof, Andrzej, Henryk, Halina, Teresa, Ewa, Anna, Jzef, Maria, Marek, Beata, Pawel, Piotr, Roman, Jacek, Wladyslaw, Jerzy, Zofia, Marian, Stefan, Bogdan, Bozena, Danuta, Dorota, Janina, Janusz, Tomasz, Irena, and Malgorzata