The form helta- in the Etymologies is a misreading according to VT/46:14
Adûnaic
-ada
preposition. to, toward, into, against, -ward
Noldorin
heltha-
verb. to strip
Black Speech
u
preposition. to
Primitive elvish
an
preposition. to
Sindarin
an
preposition. to, towards, for
With suffixed article and elision in aglar'ni Pheriannath
an
to
_ prep. _to, for. naur an edraith ammen! 'fire [be] for rescue/saving for us'. aglar an|i Pheriannath 'glory to all the Halflings'.
na
to
e _ prep. _to, towards (of spacetime). n' before vowels. >> nan 2
na
preposition. to
prep. to Na-chaered palan-díriel lit. "To-distance (remote) after-gazing" >> na-chaered, nan 2
an
to
(prep.) an (+ nasal mutation), with article ni "to the" (+ nasal mutation in plural).
an
to
(adverbial prefix) an-. 3)
Quenya
-nna
to
-n (1) dative ending, originating as a reduced form of -nă "to", related to the allative ending -nna (VT49:14). Attested in nin, men, ten, enyalien, Erun, airefëan, tárin, yondon (q.v.) and also added to the English name Elaine (Elainen) in a book dedication to Elaine Griffiths (VT49:40). The longer dative ending -na is also attested in connection with some pronouns, such as sena, téna, véna (q.v.), also in the noun mariéna from márië "goodness" (PE17:59). Pl. -in (as in hínin, see hína), partitive pl. -lin, dual -nt (Plotz). The preposition ana (#1) is said to be used "when purely dative formula is required" (PE17:147), perhaps meaning that it can replace the dative ending, e.g. *ana Eru instead of Erun for "to God". In some of Tolkiens earlier material, the ending -n (or -en) expressed genitive rather than dative, but he later decided that the genitive ending was to be -o (cf. such a revision as Yénië Valinóren becoming Yénië Valinórëo, MR:200).
-nna
to, at, upon
-nna "to, at, upon", allative ending, originating from -na "to" with fortified n, VT49:14. Attested in cilyanna, coraryanna, Endorenna, Elendilenna, númenórenna, parma-restalyanna, rénna, senna, tielyanna, q.v. If a noun ends in -n already, the ending -nna merges with it, as in Amanna, formenna, Elenna, númenna, rómenna as the allative forms of Aman, formen, elen, númen, rómen (q.v.). Plural -nnar in mannar, valannar, q.v.
ana
to
ana (1) prep. "to" (VT49:35), "as preposition _ana _is used when purely _dative formula is required" (PE17:147), perhaps meaning that the preposition ana can be used instead of the dative ending -n (#1, q.v.) Also as prefix: ana- "to, towards" (NĀ1); an (q.v.) is used with this meaning in one source (PE17:127)_
na
to, towards
na (2) prep. "to, towards", possibly obsoleted by #1 above; for clarity writers may use the synonym ana instead (NĀ1). Originally, Tolkien glossed na as "at, by, near"; the new meaning entered together with the synonyms an, ana (VT45:36).
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
Gnomish
to
proper name. To
A prepositional suffix variously translated as “(in)to” or “(to)ward”, and in one place “against” (SD/247, SD/429). It can appears as either -ada or -ad (SD/429), but in most examples it is -ada, the one exception being Gimlad “Starwards”.