Son of Elrond (LotR/227). This name is translated “Elf-man”, a combination of archaic Sindarin †Ell “elf” and Adan “man” (Let/281-2).
Conceptual Development: In Lord of the Rings drafts from the 1940s, this character was first named N. Elboron (WR/297). Earlier still, the name Ilk. Elboron used as a name for a son of Dior (LR/147).
ell (from CE *eldā- connected or concerned with the stars) + adan (“a man from one of the three houses of the Edain”)