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"
"essence, nature, world"
"possessor of good; wealthy king"
"beauty, love"
"trusted companion"
"handsome, well-born"
"Saturn (planet), ancient and wise"
"honorable, reverend"
"eagle, swift and free"
"pleased, at peace"
"one, unity, the one God"
"precious, incomparable"
"excellence, perfection"
"sky, heavens"
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.