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"
"kola nut, sacred plant"
"bright, shining"
"will, desire + helmet, protection"
"from the island of Thera"
"excellent, outstanding"
"blind"
"pearl"
"life, living"
"gift of God"
"of good birth, aristocratic"
"sorrows, pains"
"short form of Valerie or Valentina"
"nourishing, kind"
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.