Caelan sits next to 5 phonetic neighbors — Kaelan, Cailan, and Kaylan are the closest matches by sound. Most share Caelan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"slender, narrow"
"bright fame"
"gates of paradise, lush"
"of the morning, daybreak"
"defender of men"
"great lord"
"free spirit, nonconformist"
"ruler of the people"
"victorious people"
"bearer of Christ"
"like the sun"
"narrow strait (via Kyle)"
"Irish Gaelic form of John"
"from the rippling water"
"power of the homeland"
"noise, tumult"
"flowing river"
"handsome, beautiful youth"
"son of John"
"heavenly, royal, exalted"
Similar sound: These names share phonetic patterns with Caelan — 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 Caelan.
Rhythm: Caelan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.