Family name Janczak (Janczak 
) , worldwide, is quite a common cognomen. The surname Janczak is characteristic of Poland, where it is quite a common surname, Latvia, where it is quite a rare surname, and Ireland, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Poland, the United States, and France. More frequently, Janczak is the forename as well as the last name.
| łukasz janczak PL (b. 1835) |
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krzysztof janczak Polish actor, PL (b. 1949) |
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| waleria janczak Polish chemist and pharmacist (1903–1959), PL (b. 1903) |
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| jan henryk janczak Officer of the Polish Army (1916-2016), PL (b. 1916) |
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| wojciech janczak (b. 1912) |
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| julian janczak Polish historian (1931-2001), PL (b. 1931) |
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| leon janczak PL (b. 1922) |
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| julian janczak Polish historian, PL (b. 1932) |
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krzysztof aleksander janczak Polish composer, PL (b. 1983) |
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| jerzy janczak Polish official, PL (b. 1939) |
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paulina janczak Polish actress, PL (b. 1990) |
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| kazimierz janczak (b. 1934) |
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| jan january janczak CH (b. 1938) |
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| eugeniusz janczak Polish sportsperson, PL (b. 1955) |
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| joachim janczak DE (b. 1947) |
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