The ever-living, deathless and the eternal one. He whose existence has neither beginning nor end.
“HE IS THE LIVING (ONE): there is no god but He: call upon Him, giving Him sincere devotion. Praise be to Allah, Lord of the Worlds!”
(40:65) The Holy Quran
From the root h-y-y, with the classical Arabic connotations: to live, living, apparent, distinct to revive to vitalize.