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Elrond: Sons
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[One] interpretation of Elrond's name is "Elf of the Cave," because it was said that he had been found in a cave after being taken captive by the sons of Feanor. The word el ... denotes "Elf" (the People of the Stars) and rond was also used to mean "cave."
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As documented in The Silmarillion, Elrond was born at the refuge of the Mouths of Sirion soon before its destruction by the sons of Fëanor. He and his brother, Elros, were captured alive. Their parents feared that they would be killed, but instead they were taken up by the brothers Maedhros and Maglor.
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In 2933, Elrond took Aragorn into his home after the two-year-old boy's father was killed by Orcs. Aragorn was the sixteenth Chieftain of the Dunedain, but Elrond did not tell him of his heritage at first and called him Estel, meaning "Hope." Elrond came to love Aragorn like his own son.
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In a letter of 1958, Tolkien gives a very detailed derivation of Elrond. When the Sons of Fëanor attacked the Exiles of Gondolin, Elrond and his brother Elros (both at that time small children) were carried off, but later found near a waterfall; Elrond was discovered in a cave behind the fall - hence 'Elf of the Cave'. However, in a much later letter (1972), Tolkien interprets the name 'Vault of Stars', and Christopher Tolkien gives the similar 'Star-dome' in his Appendix to The Silmarillion. Whether it was Tolkien's intention to change the derivation of Elrond, or whether the older story simply slipped his mind, cannot now be known.
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