Where does “Τσέχος” come from?

Τσέχος (Greek) comes from Czech čech, from Old Czech Čech, from Proto-Slavic čelověkъ, from Proto-Indo-European (s)kʷel-, from Proto-Indo-European kʷel- — to turn.

Ancestry of “Τσέχος”, step by step

StepLanguageWordMeaning
1Czechčech—
2Old CzechČechCzech person
3Proto-Slavicčelověkъman, human
4Proto-Indo-European(s)kʷel-crowd, people
5Proto-Indo-Europeankʷel-to turn
Every word from Proto-Indo-European kʷel- →Every word from Proto-Indo-European (s)kʷel- →Every word from Proto-Slavic čelověkъ →