maeg (“sharp, piercing, penetrating”) + glîn (“gleam, glint [of eyes]”)
maeglinmasculine name. Sharp Glance, Sharp-glance
Conceptual Development: In the earliest Lost Tales, his name was G. Meglin (LT2/164), and remained N. Meglin in Silmarillion drafts from the 1930s (SM/136, LR/274); the meaning of the earlier forms of this name is unclear. In Silmarillion revisions from the 1950s-60s, Tolkien considered several other replacements: Glindûr, Targlîn, Morlîn and Morleg (WJ/91, 323), but ultimately settled on Maeglin (WJ/122, note §119).
Maeglin means "sharp glance" in Sindarin, a name which he received from his father when he was twelve. It is formed by the union of maeg, which translates as "sharp" or "piercing", "penetrating" and glîn, meaning "gleam", "glint" (of eyes). At birth, Aredhel gave Maeglin the mother-name of Lómion, meaning "Child of Twilight" in Quenya. It comes from lómë, a noun that translates as "dusk", "twilight" and also "night".