Where does “sztwortek” come from?
sztwortek (Silesian) comes from Old Polish czwartek, from Proto-Slavic četvьrtъkъ, from Proto-Slavic četvьrtъ, from Proto-Balto-Slavic ketwirtas, from Proto-Indo-European *kʷetwr̥tós.
sztwortek (Silesian): Thursday
Ancestry of “sztwortek”, step by step