Where does “dah” come from?

dah (Middle Persian) comes from Old Persian 𐎭𐎰, from Proto-Iranian daśa, from Sanskrit दश, from Sanskrit देश, from Proto-Indo-Aryan dayśás, from Proto-Indo-Iranian dayćás, from Proto-Indo-European deyḱ- — to point out.

Ancestry of “dah”, step by step

Step	Language	Word	Meaning
1	Old Persian	𐎭𐎰	—
2	Proto-Iranian	daśa	—
3	Sanskrit	दश	ten
4	Sanskrit	देश	point, region, spot, place, part, portion;...
5	Proto-Indo-Aryan	dayśás	point, region, part; country, province
6	Proto-Indo-Iranian	dayćás	part, point; country
7	Proto-Indo-European	deyḱ-	to point out

Every word from Proto-Indo-European deyḱ- →Every word from Proto-Indo-Iranian dayćás →Every word from Proto-Indo-Aryan dayśás →