Janek (Czech and Slovak feminine: Janková) is a Czech, Slovak and Polish surname, derived from the given name Janek.
The Polish surname has a dialectal form, Jonek. Polish archaic feminine forms include Jankowa (after husband) and Jankówna (after father). These forms are still used colloquially.
Notable people with the surname include:
Ivan Janek (born 1986), Slovak footballer Jolanta Janek (born 1963), Polish diplomat Kyle Janek (born 1958), American politician and medical doctor Martina Janková (born 1972), Czech opera singer Tomáš Janek (born 1983), Slovak ice hockey player
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