Keiran sits next to 5 phonetic neighbors — Kieran, Kiran, and Caelan are the closest matches by sound. Most share Keiran's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dark one, little dark one"
"pledge or oath"
"enclosure, yard, garden"
"independent, nonconformist"
"small songbird, finch"
"army, host"
"God is salvation"
"rocky hill town"
"zero, the concept of nothing"
"invented modern name, possibly blade-valley"
"great happiness, delight"
"guelder rose tree; handsome youth"
"best, excellent"
"from the rock (place surname variant)"
"modern blend of Jay and Gavin elements"
"victorious people (via Kai + Nicholas blend)"
"son of Rawlin"
"defender of men"
"victorious people"
"stone, solid mass"
Similar sound: These names share phonetic patterns with Keiran — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish origins, giving them the same cultural heritage as Keiran.
Rhythm: Keiran is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.