Arion sits next to 3 phonetic neighbors — Orion, Adrian, and Arian are the closest matches by sound. Most share Arion's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"with melody, melodious"
"sword"
"shining, brilliant"
"vision, ghost"
"sky god, shining deity"
"unity, excellence, number one"
"male deer, strong young man"
"rocky hill settlement"
"of the people (from Germanic Deutsch)"
"swift warrior"
"leopard, swift and agile"
"narrow valley, mountain valley"
"tumult, riot"
"little fire"
"lake of the sage Kashyapa (Sanskrit etymology)"
"of the Dorians"
"settlement at the clean/pure place"
"shining with glory"
"precious green stone"
"son of grace; graceful"
Similar sound: These names share phonetic patterns with Arion — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Arion.
Rhythm: Arion is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.