Kaelyn sits next to 5 phonetic neighbors — Kaylee, Caitlin, and Jaelyn are the closest matches by sound. Most share Kaelyn's Celtic/Irish via Caitlin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"keeper of the keys; pure"
"beloved"
"mist from heaven, royal mist"
"from Hadria (short for Adriaan)"
"immortal"
"sun, bright"
"grace, favor"
"calla lily flower"
"resolute guardian"
"God has spoken (via Amariah)"
"strong, powerful work"
"favored, kind"
"strength in work, industrious"
"fairest of all"
"bright day, daylight"
"gracious, dear one"
"feminine form of Charles"
"laurel, victory"
"fairy queen (via Titania)"
"modern invented name; jay bird + lyn suffix"
"dream, vision"
Similar sound: These names share phonetic patterns with Kaelyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic/Irish via Caitlin origins, giving them the same cultural heritage as Kaelyn.
Rhythm: Kaelyn is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.