He whose existence has no end. The only one being who will remain for ever, even after everything is annihilated.
And call not, besides Allah, on another god. There is no god but He. EVERYTHING (THAT EXISTS) WILL PERISH EXCEPT HIS OWN FACE. To Him belongs the Command, and to Him will ye (all) be brought back.
(28:88) The Holy Quran
“He is the First (al-Awwal) and the Last (al-ākhir), the Ascendant and the Intimate, and He is, of all things, Knowing.” ( The Holy Qur’an 57:3)
From the root a-kh-r which has the following classical Arabic connotations:to put back, to put behind, to be latter to postpone, to put at the end to be last, final, ultimate