Where does “kiejniekiej” come from?

kiejniekiej (Polish) comes from Polish nie, from Old Polish nie, from Proto-Slavic ne, from Proto-Balto-Slavic nē, from Proto-Indo-European né — not; no.

Ancestry of “kiejniekiej”, step by step

StepLanguageWordMeaning
1Polishnieno; not; don't, didn't "etc."; accusative...
2Old Polishnienegation particle; no, not
3Proto-Slavicnenot
4Proto-Balto-Slavicnēnot
5Proto-Indo-Europeannénot; no
Every word from Proto-Indo-European né →Every word from Proto-Balto-Slavic nē →Every word from Proto-Slavic ne →