Cognate with West Frisian even (“even”), Low German even (“even”), Dutch even (“even, equal, same”), effen, German eben (“even, flat, level”), Danish jævn (“even, flat, smooth”), Swedish jämn (“even, level, smooth”), Icelandic jafn, jamn (“even, equal”), Old Cornish eun (“equal, right”) (attested in Vocabularium Cornicum eun-hinsic (“iustus, i. e., just”)), Old Breton eun (“equal, right”) (attested in Eutychius Glossary eunt (“aequus, i. e., equal”)), Middle Breton effn, Breton eeun, Sanskrit अम्नस् (amnás, “(adverb) just, just now; at once”).

The verb descends from Middle English evenen, from Old English efnan; the adverb from Middle English evene, from Old English efne.

The traditional proposal connecting the Germanic adjective with the root Proto-Indo-European *h₂eym-, (Latin imāgō (“picture, image, likeness, copy”), Latin aemulus (“competitor, rival”), Sanskrit यमस् (yamás, “pair, twin”)) is problematic from a phonological point of view.