The Book of Nehemiah refers to some king "Artaxerxes" of Persia, whereas the Book of Esther refers to some "Assuerus."
(Nehemiah 2:1) And it came to pass in the month of Nisan, in the twentieth year of Artaxerxes the king: that wine was before him, and I took up the wine, and gave it to the king: and I was as one languishing away before his face.
(Esther 1:1) In the days of Assuerus, who reigned from India to Ethiopia over a hundred and twenty-seven provinces:
The names are similar, although not exactly the same. Could they both in fact refer to the same individual? Kind of like how "Reuel" and "Jethro" are almost certainly two names for the same person?