Earliest name for the Minas Tirith of Beleriand in Silmarillion drafts from the 1930s (LR/146 note #14), a combination of the name Inglor and mindon “tower”.
Noldorin
inglor
masculine name. *Heart of Gold
inglormindon
place name. Inglormindon
inglorion
masculine name. Inglorion
linglor(el)
feminine name. Linglor(el)
Earliest names for S. Nimrodel in Lord of the Rings drafts from the 1940s, also appearing as Inglorel and (rejected) Taiglin. The meaning of these names is unclear, but like her later name, they were also applied to the river named after her.
In Silmarillion drafts from the 1930s, this name appeared as the true Elvish name of Felagund “Lord of Caves”, which was his title as the lord of Nargothrond (LR/116). In The Etymologies, Inglor was given as a derivative of ᴹ✶Indo-ʒlaurē, in effect a compound of N. ind “heart” and N. glaur “gold”, so “✱Heart of Gold”.
Conceptual Development: See S. Felagund for a discussion of the conceptual development of this and related names, and see S. Inglor for the later developments of this name.