Per Wikipedia, “Eleanor” is related to the Occitan phrase “alia Aenor”, translated to “the other Aenor”. “Aenor” may itself be a corruption of “Adamardis”, apparently a feminine form of “Ademar”. “Ademar” is a masculine Germanic name, ultimately derived from “Audamar”, from the elements aud “wealth, prosperity” and mar “fame”.
From Adenorde: 'adal' - noble or 'alda' - old, ancient, and 'nord' - North. Or from Adamardis (f), Ademar(m): 'aud' - wealth, and 'meri' - famous.
― Anonymous User 1/23/2021
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I'm confused as to how "the other Aenor" can be the only explanation for Eleanor, as, contrary to what's stated, Eleanor of Aquitaine doesn't seem to have been the first bearer of the name. Éléonore de Blois-Champagne seems to have been at least 18 years older than Eleanor of Aquitaine, and her mother's name was Adela, not Aenor.https://www.geni.com/people/%C3%89l%C3%A9onore-de-Blois-Champagne/6000000005598859553. [noted -ed]
Another theory on the origin of the name, in the context of Eleanor of Aquitaine, is that her name came from a corruption of the Old French ALIA - AENOR, meaning 'the daughter of Aenor'. [noted -ed]
Eleanor of Aquitaine's name (in the form Alienor) comes from the compound of her mother's name Aenor and the Latin(?) prefix 'alia' meaning 'other'. Essentially her name meant 'the other Aenor'.
Another version of this name is Elanor. This can be taken as a form of Eleanor, or by its Quenya meaning, 'sun-star'. In JRR Tolkien's novel 'The Lord of the Rings' Elanor is the name of both a golden five-pointed flower that grows in the woods of Lothlorien and of Samwise and Rose Gamgee's eldest daughter due to her blonde hair.