Where does “*kotorъjь” come from?

*kotorъjь (Proto-Slavic) comes from Proto-Indo-European kʷóteros, from Proto-Indo-European kʷos, from Proto-Indo-European kʷ- — The primary interrogative root.

Ancestry of “*kotorъjь”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeankʷóteroswhich of two
2Proto-Indo-EuropeankʷosSee *kʷis
3Proto-Indo-Europeankʷ-The primary interrogative root

Words derived from “*kotorъjь”

Every word from Proto-Indo-European kʷ- →Every word from Proto-Indo-European kʷos →Every word from Proto-Indo-European kʷóteros →