Arun sits next to 4 phonetic neighbors — Aaron, Aroon, and Arjun are the closest matches by sound. Most share Arun's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dawn, reddish glow of sunrise"
"crystal, silver"
"younger sibling (honorific use)"
"epithet of Lord Indra"
"spring of water, water gift"
"friend, companion"
"brave king, royal warrior"
"action, deed, fate"
"cave dweller, one who lives in the cave"
"unerring, effective, achieving its mark"
"triumphant warrior"
"fearless one"
"blessed by the goddess of prosperity"
"king, emperor, ruler"
"marked by strength, powerful one"
"indestructible, imperishable"
"strong, forceful, swift"
Similar sound: These names share phonetic patterns with Arun — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Arun.
Rhythm: Arun is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.