Roshan sits next to 4 phonetic neighbors — Rohan, Roman, and Ronan are the closest matches by sound. Most share Roshan's Persian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, shining, luminous"
"backbone, foundation"
"of the divine spirit"
"oak tree"
"sun"
"cold, dry air; frost"
"pearl of wisdom"
"king, royal"
"great king, emperor"
"those devoted to doing good"
"moonshine, lunar glow"
"leader, commander, chief"
"son of the right hand"
"father of many nations"
"wise, judicious"
Similar sound: These names share phonetic patterns with Roshan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Persian origins, giving them the same cultural heritage as Roshan.
Rhythm: Roshan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.