Where does “स्थापयति” come from?

स्थापयति (Sanskrit) comes from Sanskrit स्था, from Proto-Indo-European *steh₂-.

Ancestry of “स्थापयति”, step by step

Step	Language	Word	Meaning
1	Sanskrit	स्था	to stand, station oneself, take up a position on;...
2	Proto-Indo-European	*steh₂-	—