For the second meaning, cf. Hadorion, a Húrin's epithet in WJ/294, Hurinionath referring to the house of Húrin the Steward in PM/202-3,218, and Gil-Galad's epithet Ereinion, cf. also the gloss of the old Qenya cognate yondo "descendant of" in PE/12:106, or the use of the same suffix in later Quenya names such as Isildurioni and Anárioni "Heirs of Isildur (resp. Anárion)" in PM/192,196
Noldorin
gwaun
noun. goose
-ion
suffix. son
bess
noun. (young) woman
bess
noun. wife
dess
noun. young woman
dî
noun. woman, lady
garn
noun. own, property
gwaun
noun. goose
ionn
noun. son
ionn
noun. scion, male descendant
For the second meaning, cf. Hadorion, a Húrin's epithet in WJ/294, Hurinionath referring to the house of Húrin the Steward in PM/202-3,218, and Gil-Galad's epithet Ereinion, cf. also the gloss of the old Qenya cognate yondo "descendant of" in PE/12:106, or the use of the same suffix in later Quenya names such as Isildurioni and Anárioni "Heirs of Isildur (resp. Anárion)" in PM/192,196
ionn
noun. son
A noun for “goose” in The Etymologies of the 1930s derived from primitive ᴹ✶wān under the root ᴹ√WĀ “blow” (Ety/WĀ), where ancient ā became au. It had a Noldorin plural form of guin, but if adapted to (Neo) Sindarin its plural would be gwoen: compare Sindarin plural S. noeg of naug “dwarf” (UT/100) vs. its Noldorin plural N. nuig (EtyAC/NAUK).