Rihaan sits next to 4 phonetic neighbors — Rehan, Rihan, and Ryhan are the closest matches by sound. Most share Rihaan's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"freedom, liberation"
"life force, prana"
"perfection, excellence, completeness"
"beautiful, adornment"
"YHWH saves"
"worshipper of Allah"
"all, without gaps"
"source, origin of all things"
"one with beautiful hair"
"safe, unharmed, peaceful"
"increasing, growing, abundance"
"new, fresh, novel"
"the one who swallows (alternative etymology)"
"light, radiance"
"beauty, grace"
"ray of light, divine portion"
"conqueror, winner, one who overcomes"
"generous, bountiful"
"worshipper of the All-Powerful"
Similar sound: These names share phonetic patterns with Rihaan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Rihaan.
Rhythm: Rihaan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.