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"
"son of the grey-haired one"
"lasting, enduring"
"thorny shrub, wild rose"
"modern invented spelling"
"one who shines, illuminates"
"tile-maker (via Tyler root)"
"Jehovah supports"
"warrior, strong fighter"
"fair, white, bright"
"supplanter, may God protect"
"raven, crow"
"warrior, battle"
"fleet of ships"
"from the steep place"
"father of peace"
"sea fortress"
"pledge, oath"
"oak meadow, clearing in the oaks"
"from Airelle (Norman place name)"
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.