-wen "maiden" as suffix, a frequent ending in feminine names like Eärwen "Sea-maiden" (SA:wen). Early "Qenya" also has -wen, feminine patronymic "daughter of" (LT1:271, 273), but the patronymic ending seems to be -iel "-daughter" in Tolkien's later Quenya.
Primitive elvish
wendē
noun. maiden, young or small woman, girl
imi
root. in
wendë noun "maid" (GWEN), wendë > vendë "maiden" (WEN/WENED, VT45:16, VT47:17). Sana wendë "that maiden" (PE16:96 cf. 90). According to VT47:17, this word for "maiden" is "applied to all stages up to the fully adult (until marriage)".Early "Qenya" also had wendi "maid, girl" (LT1:271); this may look like a plural form in Tolkiens later Quenya. On the other hand, VT48:18 lists a word wendi "young or small woman, girl". It is unclear whether this is Quenya or a Common Eldarin form, but probably the former: PE17:191 displays the word for "maiden" as wendē, so the Quenya stem form is probably *wende- rather than wendi*-, the stem-form that would result from Common Eldarin wendi). In his Quenya translation of the Sub Tuum Praesidium, Tolkien used Wendë/Vendë to translate "virgin" with reference to the Virgin Mary. Here the plural genitive Wenderon appears in the phrase Wendë mi Wenderon "Virgin of Virgins"; we might have expected Wendion instead (VT44:18).If the pl. form of wendë is wender rather than wendi, as the gen.pl. wenderon suggests, this may be to avoid confusion with the sg. wendi** "girl".