Rihanna sits next to 4 phonetic neighbors — Rhiannon, Brianna, and Arianna are the closest matches by sound. Most share Rihanna's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"great queen"
"resurrection (via Anastasia)"
"to pay homage"
"diminutive of Dorothy, beloved pet name"
"illustrious, brilliant"
"pearl"
"mist from heaven, royal mist"
"commander, noble woman"
"God is my refuge, the Lord is just"
"grassy island"
"favored, kind"
"follower of Christ (via Christiana/Tatiana)"
"famous warrior"
"light, radiance"
"born in June; youthful"
"new, star-like"
"sequence of musical notes"
"successful, prosperous"
"olive tree, peace"
"God is gracious"
"pure"
Similar sound: These names share phonetic patterns with Rihanna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic via Welsh origins, giving them the same cultural heritage as Rihanna.
Rhythm: Rihanna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.