Where does “dobrovolně” come from?
dobrovolně (Czech) comes from Czech dobrovolný, from Czech vůle, from Old Czech vóle, from Proto-Slavic *voľà, from Proto-Balto-Slavic wáljāˀ, from Proto-Indo-European welh₁- — to choose; to want.
dobrovolně (Czech): voluntarily
Ancestry of “dobrovolně”, step by step