Where does “Tchecoslováquia” come from?

Tchecoslováquia (Portuguese) comes from Portuguese tcheco, 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 “Tchecoslováquia”, step by step

Tchecoslováquia traces back through two separate lines of ancestry.

via Portuguese tcheco

StepLanguageWordMeaning
1PortuguesetchecoCzech (Person from the Czech Republic; Czech
2Czechčech—
3Old CzechČechCzech person
4Proto-Slavicčelověkъman, human
5Proto-Indo-European(s)kʷel-crowd, people
6Proto-Indo-Europeankʷel-to turn

via Portuguese Eslováquia

StepLanguageWordMeaning
1PortugueseEslováquia—
Every word from Proto-Indo-European kʷel- →Every word from Proto-Indo-European (s)kʷel- →Every word from Proto-Slavic čelověkъ →