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dauphin [dauphin 词源字典]: dauphin: [15] The eldest sons of the French king were from 1349–1830 designated by a title which is essentially the same word as English dolphin. It was originally applied to the lords of the Viennois, an area in the southeast of France, whose coat of arms incorporated three dolphins. After the Viennois province of Dauphiné was sold by Charles of Valois to the French crown in 1343, the king gave it to his eldest son, and from then on all eldest sons inherited it along with the title dauphin.
=> dolphin[dauphin etymology, dauphin origin, 英语词源]
Ashkenazim (n.): (plural) "central and northern European Jews" (as opposed to Sephardim, Jews of Spain and Portugal), 1839, from Hebrew Ashkenazzim, plural of Ashkenaz, eldest son of Gomer (Gen. x:3), also the name of a people mentioned in Jer. li:27 (perhaps akin to Greek skythoi "Scythians," compare Akkadian ishkuzai); identified historically with various people; in Middle Ages, with the Germans.
cadet (n.): c. 1610, "younger son or brother," from French cadet "military student officer," noun use of adjective, "younger" (15c.), from Gascon capdet "captain, chief, youth of a noble family," from Late Latin capitellum, literally "little chief," hence, "inferior head of a family," diminutive of Latin caput "head" (see capitulum). "The eldest son being regarded as the first head of the family, the second son the cadet, or little head" [Kitchin].

Apparently younger sons from Gascon noble families were sent to French court to serve as officers, which gave the word its military meaning. In English, the meaning "gentleman entering the military as a profession" is from 1650s, and that of "student at a military college" is from 1775.
dauphin (n.): "eldest son of the king of France" (title in use from 1349-1830), early 15c., from Middle French dauphin, literally "dolphin" (see dolphin).

Originally the title attached to "the Dauphin of Viennois," whose province (in the French Alps north of Provence) came to be known as Dauphiné. Three dolphins were on the coat of arms of the lords of Viennois, first worn by Guido IV (d.1142). It is said originally to have been a personal name among the lords of Viennois. Humbert III, the last lord of Dauphiné, ceded the province to Philip of Valois in 1349, on condition that the title be perpetuated by the eldest son of the king of France. The French fem. form is dauphine.
Enoch: masc. proper name, in Old Testament eldest son of Cain, father of Methuselah, from Latin Enoch, from Greek Enokh, from Hebrew Hanokh, literally "dedicated, consecrated," from hanakh "he dedicated," whence also Hanukkah. Related: Enochian.
Islam (n.): "religious system revealed by Muhammad," 1818, from Arabic islam, literally "submission" (to the will of God), from root of aslama "he resigned, he surrendered, he submitted," causative conjunction of salima "he was safe," and related to salam "peace."
... Islam is the only major religion, along with Buddhism (if we consider the name of the religion to come from Budd, the Divine Intellect, and not the Buddha), whose name is not related to a person or ethnic group, but to the central idea of the religion. ["The Heart of Islam: Enduring Values for Humanity," Seyyed Hossein Nasr, 2002]
Earlier English names for the faith include Mahometry (late 15c.), Muhammadism (1610s), Islamism (1747), and Ismaelism (c. 1600), which in part is from Ishmaelite, a name formerly given (especially by Jews) to Arabs, as descendants of Ishmael (q.v.), and in part from Arabic Ismailiy, name of the Shiite sect that after 765 C.E. followed the Imamship through descendants of Ismail (Arabic for Ishmael), eldest son of Jafar, the sixth Imam. The Ismailians were not numerous, but among them were the powerful Fatimid dynasty in Egypt and the Assassins, both of whom loomed large in European imagination.
Reuben: masc. proper name, Old Testament eldest son of Jacob and name of the tribe descended from him, from Greek Rouben, from Hebrew Reubhen, probably literally "Behold a son," from reu, imperative of ra'ah "he saw" + ben "a son." As a typical name of a farmer, rustic, or country bumpkin, from 1804. The reuben sandwich (1956) is "Not obviously connected" with the sense in rube [OED], possibly from Reuben's restaurant, a popular spot in New York's Lower East Side.
Thor: Odin's eldest son, strongest of the gods though not the wisest, c.1020, from Old Norse Þorr, literally "thunder," from *þunroz, related to Old English þunor (see thunder (n.)). His weapon was the hammer mjölnir ("crusher").