From Middle English lyvere, lyver, from Old English lifer, from Proto-Germanic *librÅ, from Proto-Indo-European *leyp-, from Proto-Indo-European *ley-. Cognate with Saterland Frisian Lieuwer, West Frisian lever, Dutch lever, German Leber, Danish, Norwegian and Swedish lever (the last three from Old Norse lifr). Related to live.
From Middle English lyvere, livere, equivalent to live + -er.