Where does “k'o” come from?

k'o (Serbo-Croatian) comes from Serbo-Croatian kȁo, from Serbo-Croatian kȁko, from Proto-Slavic kako, from Proto-Slavic kakъ, from Proto-Balto-Slavic *kōkos.

Ancestry of “k'o”, step by step

StepLanguageWordMeaning
1Serbo-Croatiankȁoas, like (the same way or kind as another)
2Serbo-Croatiankȁkohow (in what way)
3Proto-Slavickakohow, in which way
4Proto-Slavickakъof what/which kind
5Proto-Balto-Slavic*kōkos—
Every word from Proto-Balto-Slavic *kōkos →Every word from Proto-Slavic kakъ →Every word from Proto-Slavic kako →