A title common to several Persian kings. The three mentioned in
the Bible are supposed to be Cyaxares (Daniel xi, 1); Xerxes (Esther); and Cambyses
An alabaster vase found at Halicarnassus gives four renderings of the
name Xerxes, viz., Persian, Khshayarsha; and the Greek,
Xerxes; the Sanskrit root Kshi means “to rule,” Kshathra
(Zend Ksathra), a king.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894