Where does “Hauptstag” come from?

Hauptstag (German) comes from German Stag, from Low German Stag, from Middle Low German stach, from Old Saxon stag, from Proto-West Germanic *stag, from Proto-Germanic stagą, from Proto-Indo-European stek-, from Proto-Indo-European stā- — to stand.

Ancestry of “Hauptstag”, step by step

StepLanguageWordMeaning
1GermanStagstay
2Low GermanStag—
3Middle Low Germanstach—
4Old Saxonstag—
5Proto-West Germanic*stag—
6Proto-Germanicstagąa stay
7Proto-Indo-Europeanstek-to stand, stell, hold; to be firm, stand fast
8Proto-Indo-Europeanstā-to stand, place
9Proto-Indo-Europeansteh₂-to stand
Every word from Proto-Indo-European steh₂- →Every word from Proto-Indo-European stā- →Every word from Proto-Indo-European stek- →