Ciaran sits next to 4 phonetic neighbors — Kieran, Keiran, and Kiran are the closest matches by sound. Most share Ciaran's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little dark one"
"son of Gilbert, son of Gib"
"descendant of the fair one"
"famous ruler"
"pledge, oath"
"rocky cliff, crag"
"crooked nose; bent river"
"powerful and brave"
"descendant of Aodh (fire)"
"raven's island"
"follower of Calvin (in Protestant tradition)"
"crooked hill"
"descendant of the salmon"
"disciple of the dove"
"great river (geographic)"
"descendant of Cinneide"
"fortress, walled Roman camp"
"jet black, black gemstone"
"from Galloway"
"from the River Irvine"
Similar sound: These names share phonetic patterns with Ciaran — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Ciaran.
Rhythm: Ciaran is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.