An untranslated term appearing between the names of different names for the Noldor and possibly other Elf-tribes on the back page of Notes on Names (NN) from 1957 (PE17/142). It stems from some very rough notes in which Tolkien considered many different forms listed one after the other, so the connections presented here are somewhat tentative.
It has multiple different plural forms: a regular form egyl < ✶okoli, and multiple forms for variants, where the word derives from ✶oklō, via syllabificaion of -l > -ol:
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ygl, ygil: The -l vocalizes to -il instead of -ol. Before the vocalization took place, the plural mutation was carried out to produce ygl, which explains, why the resulting form is ygil instead of egil, which would be usuall for o in non-final syllables.
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ygli: This form is rather unusual for a Sindarin word, as final vowels usually vanish, but the note also includes what seems to be a dierct reference to this rule “?ḷ́ < li, ṛ́ < ri” (PE17/142).
pl1. ygil, ygli n.