Etymology
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melon (n.)

late 14c., meloun, "herbaceous, succulent trailing annual plant," or its sweet, edible fruit, from Old French melon (13c.) and directly from Medieval Latin melonem (nominative melo), from Latin melopeponem, a kind of pumpkin, from Greek mēlopepon "gourd-apple" (name for several kinds of gourds bearing sweet fruit), from mēlon "apple" (see malic) + pepon, a kind of gourd, which is probably a noun use of pepon "ripe" (see pumpkin).

Among the earliest plants to be domesticated. In Greek, melon was used in a generic way for all foreign fruits (compare similar use of apple). The Greek plural of "melon" was used from ancient times for "a girl's breasts."

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watermelon (n.)
1610s, from water (n.1) + melon. So called for being full of thin juice. Compare French melon d'eau.
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apple (n.)

Old English æppel "apple; any kind of fruit; fruit in general," from Proto-Germanic *ap(a)laz (source also of Old Saxon, Old Frisian, Dutch appel, Old Norse eple, Old High German apful, German Apfel), from PIE *ab(e)l- "apple" (source also of Gaulish avallo "fruit;" Old Irish ubull, Lithuanian obuolys, Old Church Slavonic jabloko "apple"), but the exact relation and original sense of these is uncertain (compare melon).

A roted eppel amang þe holen, makeþ rotie þe yzounde. ["Ayenbite of Inwit," 1340]

In Middle English and as late as 17c., it was a generic term for all fruit other than berries but including nuts (such as Old English fingeræppla "dates," literally "finger-apples;" Middle English appel of paradis "banana," c. 1400). Hence its grafting onto the unnamed "fruit of the forbidden tree" in Genesis. Cucumbers, in one Old English work, are eorþæppla, literally "earth-apples" (compare French pomme de terre "potato," literally "earth-apple;" see also melon). French pomme is from Latin pomum "apple; fruit" (see Pomona).

As far as the forbidden fruit is concerned, again, the Quran does not mention it explicitly, but according to traditional commentaries it was not an apple, as believed by Christians and Jews, but wheat. [Seyyed Hossein Nasr, "The Heart of Islam: Enduring Values for Humanity," 2002]

Apple of Discord (c. 1400) was thrown into the wedding of Thetis and Peleus by Eris (goddess of chaos and discord), who had not been invited, and inscribed kallisti "To the Prettiest One." Paris, elected to choose which goddess should have it, gave it to Aphrodite, offending Hera and Athene, with consequences of the Trojan War, etc.

Apple of one's eye (Old English), symbol of what is most cherished, was the pupil, supposed to be a globular solid body. Apple-polisher "one who curries favor" first attested 1928 in student slang. The image in the phrase upset the apple cart "spoil the undertaking" is attested from 1788. Road-apple "horse dropping" is from 1942.

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honeydew (n.)
also honey-dew, 1570s, "sticky sweet substance found in small drops on trees and plants," from honey (n.) + dew (n.); Similar formation in Dutch honigdaauw, German Honigthau. honeydew melon first recorded 1916, a cross between cantaloupe and a South African melon.
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musk (n.)

odoriferous reddish-brown substance secreted by the male musk deer (dried and used in medicinal preparations and as a perfume), late 14c., from Old French musc (13c.) and directly from Medieval Latin muscus, from Late Greek moskhos, from Persian mushk, from Sanskrit muska-s "testicle," from mus "mouse" (so called, presumably, for resemblance; see muscle). The deer gland was thought to resemble a scrotum. German has Moschus, from a Medieval Latin form of the Late Greek word. Spanish has almizcle, from Arabic al misk "the musk," from Persian.

The musk-deer, the small ruminant of central Asia that produces the substance, is so called from 1680s. The name musk was applied to various plants and animals of similar smell, such as the Arctic musk-ox (1744). Musk-melon "the common melon" (1570s) probably originally was an oriental melon with a musky smell, the name transferred by error [OED]. Also compare Muscovy.

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pumpkin (n.)

1640s, "gourd-like fruit, of a deep orange-yellow color when ripe, of a coarse decumbent vine native to North America," an alteration of pompone, pumpion "melon, pumpkin" (1540s), from French pompon, from Latin peponem (nominative pepo) "melon," from Greek pepon "melon." The Greek word is probably originally "ripe," on the notion of "cooked (by the sun)," from peptein "to cook" (from PIE root *pekw- "to cook, ripen"). With ending conformed to words in -kin.

Figuratively, in 19c. (and later) U.S. vernacular, it has meant both "stupid, self-important person" and "person or matter of importance" (as in some pumpkins).

Pumpkin-pie is recorded from 1650s. Pumpkin-head, American English colloquial for "person with hair cut short all around" is recorded by 1781. Vulgar American English alternative spelling punkin attested by 1806.

America's a dandy place:
The people are all brothers:
And when one's got a punkin pye,
He shares it with the others.
[from "A Song for the Fourth of July, 1806," in The Port Folio, Philadelphia, Aug. 30, 1806]
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cantaloupe (n.)
also cantaloup, small, round type of melon, 1739, from French, from Italian, from Cantalupo, name of a former Papal summer estate near Rome, where the melons first were grown in Europe after their introduction (supposedly from Armenia). The place name seems to be "singing wolf" and might refer to a spot where wolves gathered, but this might be folk etymology.
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marmalade (n.)

1530s, "preserve or confection of pulpy consistence made from quince," from French marmelade, from Portuguese marmelada "quince jelly, marmalade," from marmelo "quince," by dissimilation from Latin melimelum "sweet apple," originally "fruit of an apple tree grafted onto quince," from Greek melimelon, from meli "honey" (from PIE root *melit- "honey") + mēlon "apple" (see malic). Extended 17c. to any preserve or confection of pulpy consistence made from a citrus fruit.

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malic (adj.)

"pertaining to apples, obtained from the juice of apples," 1790 (in malic acid, in a translation of Fourcroy), from French malique, from Latin mālum "apple" from Greek mēlon (Doric malon) "apple," which is probably from the Pre-Greek substrate language. The Latin and Greek words also meant "fruit" generally, especially if exotic. The acid, discovered 1785 by Swedish/German chemist Carl Wilhelm Scheele, was obtained from unripe apples and other fruits. 

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chamomile (n.)

common name of a strong-scented European plant long cultivated for its medicinal properties, c. 1300, camomille, from Old French camemile, from Late Latin camomilla, from Latin chamomilla, from Greek chamaimelon, literally "earth apple," from chamai "on the ground" (also "dwarf;" akin to chthon "earth," from PIE root *dhghem- "earth") + mēlon "apple" (see malic). So called for its scent. Old English had it as camemalon.

Fowler (1927) writes that "Ca- is the literary & popular form; cha-, which represents the Latin & Greek spelling but has no chance of general acceptance, would be better abandoned in pharmacy also." But for this once his pessimism seems to have been undue; British English kept the older spelling, American English favored the classically correct one, and on the internet the American spelling seems to have prevailed.

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