Where does “यवन” come from?

यवन (Sanskrit) comes from Prakrit 𑀬𑁄𑀦, from Old Persian 𐎹𐎢𐎴, from Ancient Greek Ἴων, from Ancient Greek Ἰᾱ́ϝων — Ionian.

यवन (Sanskrit): a foreigner, barbarian not part of the four-tiers...