Where does “никой” come from?

никой (Russian) comes from Russian кой, from Old East Slavic къи, from Proto-Slavic kъjь, from Proto-Slavic -jь, from Proto-Indo-European yós, from Proto-Finnic wiša, from Proto-Indo-Iranian wišás, from Proto-Indo-European wisós — fluidity, slime, poison; poison; poison; slime;...

никой (Russian): not any, no

Definitions

  1. not any, no

Ancestry of “никой”, step by step

никой traces back through two separate lines of ancestry.

via Russian кой

StepLanguageWordMeaning
1Russianкойhow, which, who, what
2Old East Slavicкъиhow, which, who, what
3Proto-Slavickъjьwhich
4Proto-Slavic-jьAdjectival inherited from the Caland roots,...
5Proto-Indo-Europeanyósthat, who, which
6Proto-Finnicwiša
7Proto-Indo-Iranianwišáspoison, venom
8Proto-Indo-Europeanwisósfluidity, slime, poison; poison; poison; slime;...

via Russian ни

StepLanguageWordMeaning
1Russianниneither, nor; not a; whatever, however
2Old East Slavicниnor, neither
3Proto-Slavicnineither, nor; not even
4Proto-Indo-Europeannēy
5Proto-Slavickogъdawhen
6Proto-Slavicgъda
Every word from Proto-Indo-European wisósEvery word from Proto-Indo-Iranian wišásEvery word from Proto-Finnic wiša