Aragorn sits next to 4 phonetic neighbors — Aedan, Aragon, and Argor are the closest matches by sound. Most share Aragorn's Sindarin Elvish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"noble valor, kingly"
"of the river Jordan"
"handsome, beautiful"
"the eighth (via Octavius root)"
"from the broad wood"
"thankful"
"law settlement, from Lexington"
"Raven; dark messenger"
"meadow land, fallow land"
"He whom Yahweh remembered"
"gentle, merciful, dear"
"dark warrior"
"oak grove"
"precious, anointed"
"fifth (born)"
"possibly from Celtic 'avon' (river)"
"Son of Neil; champion lineage"
"large town, community"
"ruler, sovereign (Greek/Latin influence on Tyrant root)"
"courageous, valiant"
Similar sound: These names share phonetic patterns with Aragorn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sindarin Elvish origins, giving them the same cultural heritage as Aragorn.
Rhythm: Aragorn is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.