Ciarah sits next to 4 phonetic neighbors — Ciara, Kira, and Sierra are the closest matches by sound. Most share Ciarah's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dark one, black-haired"
"Round; gentle"
"adorned nobility (with Slavic suffix)"
"from India; of the Indus River"
"ruler, king's heir"
Similar sound: These names share phonetic patterns with Ciarah — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Ciarah.
Rhythm: Ciarah is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.