kṣiti (Old Javanese) comes from Sanskrit क्षिति, from Proto-Indo-Aryan gẓʰítiṣ, from Proto-Indo-Iranian gžʰítiš, from Proto-Indo-European dʰgʷʰítis, from Proto-Indo-European dʰgʷʰey- — to decline; to perish.
kṣiti (Old Javanese): earth