Kailan sits next to 4 phonetic neighbors — Kaylin, Kaelyn, and Kailyn are the closest matches by sound. Most share Kailan's Chinese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"modern variant of Kailyn — pure, victorious (from Kay family of names)"
"dark beauty"
"gentle rhythmic movement, to bend gracefully"
"creative American name blending La- prefix with -taysia element"
"Wistar's flower"
"goddess of fortune and luck"
Similar sound: These names share phonetic patterns with Kailan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American origins, giving them the same cultural heritage as Kailan.
Rhythm: Kailan is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.