Where does “Ahasuerus” come from?
Ahasuerus comes from Hebrew אֲחַשְׁוֵרוֹשׁ, borrowed from Old Persian 𐎧𐏁𐎹𐎠𐎼𐏁𐎠, itself derived from Old Persian 𐏋 and Proto-Iranian xšáyati, ultimately from Proto-Indo-European tek-.
Ancestry of “Ahasuerus”, step by step