Where does “Čečensko” come from?

Čečensko (Slovak) comes from Middle Mongolian čečen, from Proto-Mongolic secen, from English sec-, from Czech co, from Old Czech čso, from Proto-Slavic česo, from Proto-Slavic čь, from Proto-Balto-Slavic ki — interrogative base.

Ancestry of “Čečensko”, step by step

StepLanguageWordMeaning
1Middle Mongoliančečenwise, clever
2Proto-Mongolicsecenwise, clever
3Englishsec-secondary-form of a functional group, a branched...
4Czechcowhat; that; isn't it so, don't you think?
5Old CzechčsoInterrogative pronoun; what
6Proto-Slavicčesowhat (interrogative)
7Proto-Slavicčьwhat; alternative form of *čьto
8Proto-Balto-Slavickiwhat
9Proto-Indo-Europeankʷídneuter nominative/accusative singular of *kʷís
10Proto-Indo-Europeankʷíswho, what; who, which, that; which, what
11Proto-Indo-Europeankʷi-interrogative base
Every word from Proto-Indo-European kʷi-Every word from Proto-Indo-European kʷísEvery word from Proto-Indo-European kʷíd