Jahan sits next to 4 phonetic neighbors — Jahan, Johan, and John are the closest matches by sound. Most share Jahan's Persian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the world, universe"
"companion, friend"
"trusted companion"
"heroic, kingly"
"one, unity, the one God"
"divine throne"
"possessor of good; wealthy king"
"essence, nature, world"
"friend, companion"
"lion-like"
"water, clarity"
"satisfied, content"
"excellence, perfection"
"Saturn (planet), ancient and wise"
"precious, incomparable"
"radiance, illumination"
Similar sound: These names share phonetic patterns with Jahan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Persian origins, giving them the same cultural heritage as Jahan.
Rhythm: Jahan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.