Where does “listeniek” come from?

listeniek (Polish) comes from Polish list, from Old Polish list, from Proto-Slavic listъ — leaf.

Ancestry of “listeniek”, step by step

StepLanguageWordMeaning
1Polishlistletter; genitive plural of lista
2Old Polishlistleaf
3Proto-Slaviclistъleaf
Every word from Proto-Slavic listъEvery word from Old Polish listEvery word from Polish list