An Etymological Dictionary of the German Language/Annotated/ewig

by Friedrich Kluge

ewig, adjective, ‘eternal, perpetual,’ from the equivalent Middle High German êwic(g), Old High German êwig; corresponding to Old Saxon êwig, Dutch eeuwig, ‘eternal’; derived from an Old Teutonic root meaning ‘eternity.’ Compare Gothic aiws, ‘time, eternity,’ Old High German êwa, ‘eternity,’ which are primitively cognate with Latin aevum, ‘eternity, lifetime,’ and Greek αἰών. Compare je.