Yón (1) noun "Son" (VT44:12, 17, referring to Jesus. Tolkien rewrote the text in question. Normally the Quenya word for "son" appears as yondo, which also refers to Jesus in one text.)
Quenya
yonya
my son
Yón
son
anon
son
anon noun "son" (PE17:170), possibly intended by Tolkien as a replacement for yondo.
anon
noun. son
A transient word for “son” in Notes on Names (NN) from 1957, written of above the more common yon-do (PE17/170).
vó
son
vó (actually spelt vô), also vondo, noun "son" (LT2:336; in Tolkien's later Quenya yondo)
yondo
son
yondo noun "son" (YŌ/YON, VT43:37); cf. yonya and the patronymic ending -ion. Early "Qenya" has yô, yond-, yondo "son" (LT2:342). According to LT2:344, these are poetic words, but yondo seems to be the normal word for "son" in LotR-style Quenya. Yón appears in VT44, 17, but Tolkien rewrote the text in question. In LT2:344, yondo is said to mean "male descendant, usually (great) grandson", but in Tolkien's later Quenya, yondo means "son", and the word is so glossed in LT2:342. Dative yondon in VT43:36 (here the "son" in question is Jesus). See also yonya. At one point, Tolkien rejected the word yondo as "very unsuitable" (for the intended meaning?), but no obvious replacement appeared in his writings (PE17:43), unless the (ephemeral?) form anon (q.v.) is regarded as such. In one source, yondo is also defined as "boy" (PE17:190).
yonyo
son, big boy
yonyo noun "son, big boy". In one version, yonyo was also a term used in children's play for "middle finger" or "middle toe", but Tolkien may have dropped this notion, deciding to use hanno "brother" as the alternative play-name (VT47:10, 15, VT48:4)
onya
my child
onya noun "my child", "my son" (not the normal word for "son", however [cf. yondo] onya seems to be derived from the stem ONO "beget") This may be a shortened form of *onnanya (see onna), like hinya "my child" (q.v.) is shortened from hinanya. It may be, then, that onya (like hinya) is only used in vocative. (UT:174)
onya
noun. my child
An affection term for “my child”, a reduction of the 1st sg. possessive form onnanya of onna “child” (PE17/170; UT/174-5).
Elements
Word Gloss onna “child, child, *offspring; [ᴹQ.] creature” -nya “my”
yonya noun with pronominal ending "my son" (evidently short for *yondonya; the form yonya may be used as a form of address only) (LR:61)