Kellan sits next to 4 phonetic neighbors — Killian, Kellen, and Kelvin are the closest matches by sound. Most share Kellan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"slender, bright-headed"
"good man, strong man"
"born of fire"
"free one"
"young warrior, free man"
"son of Bron"
"wayfarer, traveler"
"from the rye field"
"little hawk or blackbird"
"courteous, well-bred"
"olive tree"
"roof maker"
"one who lives in a valley"
"speed of God"
"from the crooked stream"
"near the holly trees"
"son of Jack"
"the koa (warrior tree)"
"short form of Benjamin: son of the right hand"
"case, container (via Old French)"
"of the angel, son of Angelo"
Similar sound: These names share phonetic patterns with Kellan — 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 Kellan.
Rhythm: Kellan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.