Where does “цар” come from?
цар (Belarusian) comes from Old East Slavic цьсарь, from Old East Slavic цѣсарь, from Proto-Slavic cěsařь, from Proto-Germanic kaisaraz, from Latin Caesar, from Latin caesaries, from Proto-Indo-European kéysero- — hair.
цар (Belarusian): king; emperor
Ancestry of “цар”, step by step