Dariun sits next to 3 phonetic neighbors — Darius, Darion, and Dorian are the closest matches by sound. Most share Dariun's Persian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"upholder of good, who holds firm the good"
"heard by God"
"something bent or curved"
"world, universe"
"dark foreigner; dark stranger"
"barley storage"
"noble estate"
"crown, wreath, garland"
"one who follows"
"sea strength, power of the sea"
Similar sound: These names share phonetic patterns with Dariun — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Persian origins, giving them the same cultural heritage as Dariun.
Rhythm: Dariun is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.