Where does “-nac” come from?

-nac (Serbo-Croatian) comes from Czech co, from Old Czech čso, from Proto-Slavic česo, from Proto-Slavic čь, from Proto-Balto-Slavic ki, from Proto-Indo-European kʷíd, from Proto-Indo-European kʷís, from Proto-Indo-European kʷi- — interrogative base.

Ancestry of “-nac”, step by step

-nac traces back through two separate lines of ancestry.

via Czech co

StepLanguageWordMeaning
1Czechcowhat; that; isn't it so, don't you think?
2Old CzechčsoInterrogative pronoun; what
3Proto-Slavicčesowhat (interrogative)
4Proto-Slavicčьwhat; alternative form of *čьto
5Proto-Balto-Slavickiwhat
6Proto-Indo-Europeankʷídneuter nominative/accusative singular of *kʷís
7Proto-Indo-Europeankʷíswho, what; who, which, that; which, what
8Proto-Indo-Europeankʷi-interrogative base

via Czech na

StepLanguageWordMeaning
1Czechnaon, onto; on; to
2Old Czechnaon, onto direction, + accusative case
3Proto-Slavicnaon; concerning; onto
4Proto-Indo-Europeanh₂en-on, onto

Words derived from “-nac”

Every word from Proto-Indo-European kʷi- →Every word from Proto-Indo-European kʷís →Every word from Proto-Indo-European kʷíd →