Etymology
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lily (n.)
Old English lilie, from Latin lilia, plural of lilium "a lily," cognate with Greek leirion, both perhaps borrowed from a corrupted pronunciation of an eastern Mediterranean word (de Vaan compares Coptic hreri, hleli "lily"). 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).

Figurative of whiteness, fairness, purity. The Latin word has become the general word in languages across Europe: German lilie, Dutch lelie, Swedish lilja, French lis, Spanish lirio, Italian giglio, Polish lilija, Russian liliya. The French word is contracted from Latin lilius, a rare surviving nominative form in French. In Old French lilie (12c.) also existed. Related: Lilied; lilaceous.

The lily of the valley translates Latin lilium convallium (Vulgate), a literal rendition of the Hebrew term in Song of Solomon ii:1; in modern times the name was applied to a particular plant (Convallaria majalis) apparently first by 16c. German herbalists. Lily pad is from 1834, American English. For gild the lily see gilded.
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valley (n.)
c. 1300, from Anglo-French valey, Old French valee "a valley" (12c.), from Vulgar Latin *vallata, from Latin vallis "valley," of unknown origin. Valley Girl (in reference to San Fernando Valley of California) was popularized 1982 in song by Frank Zappa and his daughter. Valley of Death (Psalms xxiii.4) was rendered in Middle English as Helldale (mid-13c.).
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lily-pad (n.)
"broad leaf of the water-lily," 1834, American English, from lily (n.) + pad (n.).
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lily-white (adj.)
early 14c., from lily + white (adj.); from 1903 with reference to whites-only segregation; 1961 as "irreproachable."
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lily-livered (adj.)
"cowardly," 1605, in "Macbeth;" from lily (in its color sense of "pale, bloodless") + liver (n.1), which was a supposed seat of love and passion. A healthy liver is typically dark reddish-brown. Other similar expressions: lily-handed "having white, delicate hands," lily-faced "pale-faced; affectedly modest or sensitive."
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crinoid (adj.)

type of stalked echinoderm found in Paleozoic fossils and, living, at great depths in the sea, 1847, from Latinized form of Greek krinoeides "lily-like," from krinon "lily" (a foreign word of unknown origin) + -oeides "like" (see -oid). So called from their resemblance to a lily or tulip. The word is attested as an adjective in English, "lily-shaped," from 1836. Related: Crinoidal.

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calla (n.)
marsh-plant found in colder parts of Europe and America, 1789, from Latin calla, the name in Pliny of an unidentified plant, perhaps a mistake for calyx. The common calla-lily (1805) is a related species, not a lily but so called for the appearance of the flowers.
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Susanna 
also Susannah, fem. proper name, from Latin Susanna, from Greek Sousanna, from Hebrew Shoshannah, literally "a lily." One of the women that attended Jesus in his journeys. Greek also borrowed the Semitic word in its literal sense as souson "lily."
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strath (n.)
"wide river valley between hills," 1530s, from Scottish, from Old Irish srath "wide river valley," from Old Celtic *s(t)rato-, from PIE root *stere- "to spread."
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