A few seekers of Scripture names, chiefly in America, have called their sons Ahasuerus, in common life Hazzy. (History of Christian Names, Yonge, 1884)

... Ahasuerus only differs from Khshayarsha by the adoption of the prosthetic א, which the Hebrews invariably placed before the Persian Khsh, and the substitution of ו for י, a common dialectic variation... (The Historical Evidences of the Truth of the Scripture Records, Rawlinson, 1860)

AHASUERUS.  A Persian king or emperor, the royal husband of Queen Esther (Esther i. 2, 9, 10, 15, 16, 17, 19; ii. 1, 12, 16, 21; iii. 1, 6, 7, 8, 12; vi. 2; vii. 5; viii. 1, 7, 10, 12; ix. 2, 20, 30; x. 1, 3).  The book of Esther tells of his sensuality, his fickleness, his absence of forethought, his despotism, and his cruelty.  Greek history presents essentially the same picture of Xerxes.  He was the son of Darius Hystaspes, whom he succeeded on the Persian throne, B.C. 486.  His mother was Atossa, the daughter of Cyrus.  In the second year of his reign he subdued the Egyptians, who had revolted against his father Darius.  After about four years' preparation, he led an immense host to invade Greece; but fled back in a cowardly way to Persia on seeing  his great fleet defeated (B.C. 480) by a much smaller number of Greek ships at Salamis.  The next year (479 B.C.) his general, Mardonius, whom he had left behind with an army, allowed his camp at Platæa to be forced by the Greeks, when such a slaughter ensued as rendered the Persian invasion hopeless.  In 466, after a reign of twenty years, Xerxes was murdered by two of his courtiers, and was succeeded on the throne by his son, Artaxerxes Longimanus, or the Long-handed.  Xerxes is believed by Sayce to have been the Ahasuerus of Ezra iv. 6, though many have thought that it was Cambyses the son of Cyrus.  With regard to Dan. ix. 1, Bosanquet (Messiah the Prince, 2nd ed., 1869, pp. 289, 290) thinks that the Ahasuerus mentioned is not Xerxes, but the Median Cyaxeres, an ancestor of Darius, or that the correct reading should be Darius and Ahasuerus. (The Sunday School Teacher's Bible Manual, Hunter, 1894)