Jahaan sits next to 4 phonetic neighbors — Jahan, Jahan, and Johann are the closest matches by sound. Most share Jahaan's Persian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"world, universe"
"evening conversation companion"
"one who seeks the right path"
"on the right side, auspicious"
"content, satisfied, blessed"
"God's pleasure, divine contentment"
"the living one"
"addition, surplus of goodness"
"cup, goblet"
"peregrine falcon"
"brave, courageous"
"intelligent, bright-minded"
"cunning, sharp-witted"
"inexhaustible, imperishable"
"trust, faithfulness"
"flowing water"
Similar sound: These names share phonetic patterns with Jahaan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Persian origins, giving them the same cultural heritage as Jahaan.
Rhythm: Jahaan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.