From Middle English lemen, from Old English lȳman, from Proto-West Germanic *liuhmijan, from Proto-Indo-European *lewk- ("light, bright").
From Middle English leme, from Old English lēoma ("ray of light, beam, radiance, gleam, glare, lightning"), from Proto-Germanic *leuhmô ("light, shine"), from Proto-Indo-European *leuk- ("light, bright"). Cognate with Icelandic ljómi ("gleam, ray, beam, flash of light"), Latin lumen ("light").