Kailynne sits next to 5 phonetic neighbors — Kaylin, Kailyn, and Cailin are the closest matches by sound. Most share Kailynne's Irish Gaelic via American invention-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pure, slender"
"God is gracious"
"holy, sacred"
"light, radiance"
Similar sound: These names share phonetic patterns with Kailynne — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic via American invention origins, giving them the same cultural heritage as Kailynne.
Rhythm: Kailynne is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.