Page "Ahasuerus" Paragraph 2

The name Xerxes comes from the Greek Ξέρξης.

The English name Ahasuerus is derived from a Latinized form of the Hebrew Akhashverosh ( אחשורוש ), which is a Hebrew rendering of the Babylonian Achshiyarshu: both this and the Greek Ξέρξης are renderings of the Old Persian Xšayāršā.

Thus this literary change was created as the name moved across each of the language groups in a westerly direction from Persia until it entered English translations of the Bible.