lily (n.) Look up lily at Dictionary.com
Old English lilie, from Latin lilia, plural of lilium "a lily," cognate with Greek leirion, both perhaps borrowed from a corrupted pronunciation of an Egyptian word. Used in Old Testament to translate Hebrew shoshanna and in New Testament to translate Greek krinon. As an adjective, 1530s, "white, pure, lovely;" later "pale, colorless" (1580s).

Also from the Latin word are German lilie, French lis, Spanish lirio, Italian giglio. The lily of the valley translates Latin lilium convallium (Vulgate), a literal rendition of the Hebrew term in Song of Solomon ii:1. It apparently was applied to a particular plant (Convallaria majalis) first by 16c. German herbalists. Lily pad is from 1834, American English.