S. Glindûr m. “*Dark Glance”
A name Tolkien considered as a possible replacement for Maeglin in the Silmarillion revisions from the 1950s-60s (WJ/91, 146), along with rejected variants Targlîn, Morlîn and Morleg (WJ/323). It appears to be a combination of glîn(n) “gleam, glint” and dûr “dark”.
References ✧ WJ/48, 91, 146, 323; WJI/Glindûr, Morleg, Morlîn, Targlîn
|dûr||“dark (with evil implications), gloomy, hellish”|