Etymology
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luni- 
word-forming element meaning "of the moon, of the moon and," from Latin luna "moon" (see luna).
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lunar (adj.)
early 15c., "crescent-shaped;" 1620s, "pertaining to the moon," from Old French lunaire (15c.), from Latin lunaris "of the moon," from luna "moon" (see luna).
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lunate (adj.)
"crescent-shaped," 1777, from Latin lunatus "half-moon shaped," from luna "moon" (see luna).
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luna (n.)
late 14c. "the moon," especially as personified in a Roman goddess answering to Greek Selene; also an alchemical name for "silver;" from Latin luna "moon, goddess of the moon," from PIE *leuksna- (source also of Old Church Slavonic luna "moon," Old Prussian lauxnos "stars," Middle Irish luan "light, moon"), suffixed form of root *leuk- "light, brightness." The luna moth (1841, American English) so called for the crescent-shaped eye-spots on its wings.
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Lunarian (n.)
1708, "moon-man, inhabitant of the moon;" see lunar + -ian. Also "expert on or student of lunar phenomena" (1817).
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lunation (n.)
"time from one new moon to the next," late 14c., from Medieval Latin lunationem, from Latin luna "moon" (see luna).
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lunette (n.)

1570s, "semi-circular partial horseshoe," from French lunette (13c.), literally "little moon," diminutive of lune "moon," from Latin luna (see luna). Later applied to a wide range of objects and ornamentations resembling more or less a crescent moon.

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moonlight (v.)

"hold a second job, especially at night," 1957 (implied in the verbal noun moonlighting), from moonlighter "one who takes a second job after hours" (1954), from the notion of working by the light of the moon; see moonlight (n.). Earlier the verb had been used to mean "commit crimes at night" (1882), from moonlighter in reference to members of organized bands that carried on agrarian outrages in Ireland. And compare moonshine. Moonlighter in American English meant "one of a party who go about serenading on moonlit nights" (by 1897).

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Selene 

moon goddess, equivalent of Latin Luna, from Greek selēnē "the moon; name of the moon goddess," related to selas "light, brightness, bright flame, flash of an eye," from PIE root *swel- (2) "to shine, beam" (source also of Sanskrit svargah "heaven," Lithuanian svilti "to singe," Old English swelan "to be burnt up," Middle Low German swelan "to smolder"); related to swelter, sultry. Related: Selenian "of or pertaining to the moon as a world," 1660s.

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hunter (n.)

"one who engages in the chase of game or other wild animals," mid-13c. (attested in place names from late 12c.), from hunt + -er (1). The Old English word was hunta, Middle English hunte. The hunter's moon (1710) is the next full moon after the harvest moon.

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