Lillain sits next to 4 phonetic neighbors — Lillian, Liliane, and Lily are the closest matches by sound. Most share Lillain's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lily flower"
"sorrows, pains"
"blind"
"breath, the living one"
"gift of God"
"of the stars, star-like"
"bright, shining"
"from Crete, the island"
"noble, exalted"
"short form of Valerie or Valentina"
"resolute protector"
"from the island of Thera"
"of good birth, aristocratic"
"Dweller at the marsh"
Similar sound: These names share phonetic patterns with Lillain — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Lillain.
Rhythm: Lillain is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.