Jareth sits next to 4 phonetic neighbors — Gareth, Jared, and Dareth are the closest matches by sound. Most share Jareth's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"invented blend of Jared and Gareth"
"God is salvation"
"God is gracious"
"from the surname of poet W.H. Auden"
"well-born, of noble descent"
"coastal land, border land"
"rowan tree"
"new house (from Xavier root)"
"from the angel clan"
"God will save"
"modern invented name, unique spirit"
"bright, splendid"
"rapid water"
"from the hazel tree settlement"
"thorny shrub, wild rose"
"son of Evar; son of the boar"
"fleet of ships"
"son of marsh dwellers"
"pointed mountain, hill"
"perfect knowledge, complete wisdom"
"rival, eager to emulate"
Similar sound: These names share phonetic patterns with Jareth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Modern English origins, giving them the same cultural heritage as Jareth.
Rhythm: Jareth is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.