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"
"modern coinage, possibly 'thankful lion'"
"mountain village; reason of the mountains (Japanese interpretation)"
"He whom Yahweh remembered"
"maile vine (sacred Hawaiian plant)"
"vigilant, watchful"
"resin, tree sap (unrelated etymology)"
"Holy hill, place of spiritual ascent"
"My father (if related to Hebrew Avi)"
"meadow land, fallow land"
"from Colt's farm"
"son of Cole (son of Nicholas)"
"Fortune, riches"
"radiant, gleaming"
"small victorious one"
"bright-headed, strife"
"road by the waterfall"
"he who descended, to descend"
"related to Cash, from Old French casse meaning chest or box"
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.