Where does “𐭣𐭥𐭮𐭲𐭩” come from?

𐭣𐭥𐭮𐭲𐭩 (Middle Persian) comes from Old Persian 𐎭𐎢𐏁𐎫𐎠, from Proto-Iranian *jawštā́.

Ancestry of “𐭣𐭥𐭮𐭲𐭩”, step by step

Step	Language	Word	Meaning
1	Old Persian	𐎭𐎢𐏁𐎫𐎠	—
2	Proto-Iranian	*jawštā́	—