↑ Kent, Roland G.(1950)Old Persian: grammar, texts, lexicon, New Haven: American Oriental Society
Etymology
From Proto-Indo-Iranian*ksayati(“he rules, he has power over”), from Proto-Indo-European*tke-(“to gain power over, gain control over”); akin to Sanskrit क्षत्र(kṣatrá, “might, power”), Avestan [script needed](xšaθra, “kingdom”), Old Armenian loanword աշխարհ(ašxarh) and Ancient Greek κτάομαι(ktáomai, “to get, acquire”).[1]