§ Eldamir, Eledon ’Elf-stone’, Qendemir (TI:276,366)
§ Eldakar ’Elfhelm’ (TI:276,366)
§ Eldavel ’Elfwold’ (TI:366)
The first line brings up another set of of Aragorn’s (Trotter’s) early names. Eldakar and Eldavel were considered as the names of his father.
Eldamir is clearly Quenya, consisting out of Elda ’Elf’ (ELED-) and #-mir ’jewel’ (MIR-, Silm.index). Eledon would then be the Noldorin cognate, containing Eledh ’Elf’ (ELED-) and -ond ’stone’, not lenited gond, gonn (GOND-, Silm.index), but rather still in the basic form ond, *onn – see the commentary to Toll-onnui and related forms above (2.36). Tolkien often spelled dh as d (as also e.g. Caras Galadon = Caras Galaðon) because according to his own words dh is not used in English and looks uncouth (UT:267).
Qendemir is then again Quenya with qende ’elf’ (KWEN(ED)-) and #-mir ’jewel’.
For final -kar in Eldakar compare #karma ’helm’ from Karma-kundo ’Helm-guardian’ (PM:260), Q. kár ’head’, kassa ’helmet’ (KAS- ’head’) and also the explanation that -kar is from kāsā < √KAS ’head’ (PE17:114).
The name Elfwold is akin to Old Norse Alfvaldr meaning ’elf-ruler’ and the Quenya name has suffixed #-vel, most probably from BEL- ’strong’ with Ilk. bel ’strength’ and similar derivatives.