The most common Quenya suffix for “daughter of” such as in Elerondiel “✱Daughter of Elrond” (PE17/56) or Uinéniel “Daughter of Uinen” (UT/182).
Conceptual Development: The earliest hint of this suffix was ᴱQ. -il mentioned by Tolkien in the Qenya Lexicon of the 1910s as the equivalent of feminine patronymic ᴱQ. -wen (QL/103), but its only use in this period was in the masculine name ᴱQ. Indorildo, a variant of ᴱQ. Indorion and hence probably meaning “son of” (LT2/217). In The Etymologies of the 1930s Tolkien mentioned ᴹQ. -iel as a feminine patronymic under the root ᴹ√YEL “daughter” (Ety/YEL¹), but this root was rejected and in that document Tolkien seems to have replaced it with ᴹQ. -ien (EtyAC/YŌ).
In later writings Tolkien considered a bewildering variety of suffixes for the feminine patronymic, including -iel(d), -well, -wend and -ien (PE17/170, 190). In practice, though, only -iel appeared in actual names for “daughter of” (see above), perhaps because it is was the cleanest equivalent of the well-established masculine patronymic -ion “son of”.
-da suffix used to derive nouns denoting the result of an action, like yulda "draught, the amount drunk" (the stem YUL is here given the meaning "drink"). (PE17:68) Cf. also carda "deed" (q.v.) vs. the verb car- "do".