Where does “которые” come from?

которые (Russian) comes from Russian кото́рый, from Old East Slavic которъ, from Proto-Slavic kotorъ, from Proto-Indo-European kʷóteros, from Proto-Indo-European kʷos, from Proto-Indo-European kʷ- — The primary interrogative root.

которые (Russian): inflection of кото́рый : ## nominative plural ##...

Definitions

  1. inflection of кото́рый : ## nominative plural ##...

Ancestry of “которые”, step by step

StepLanguageWordMeaning
1Russianкото́рыйwhat, which (among a specific series)
2Old East Slavicкоторъwhich, that, who, whom
3Proto-Slavickotorъwhich
4Proto-Indo-Europeankʷóteroswhich of two
5Proto-Indo-EuropeankʷosSee *kʷis
6Proto-Indo-Europeankʷ-The primary interrogative root
Every word from Proto-Indo-European kʷ- →Every word from Proto-Indo-European kʷos →Every word from Proto-Indo-European kʷóteros →
которые — Etymology, Origin & Word History | Etymology Explorer