Lillian sits next to 5 phonetic neighbors — Lily, Lila, and Liliana are the closest matches by sound. Most share Lillian's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lily flower, pure"
"ewe, gentle; lake"
"woman from Magdala (tower)"
"night rain"
"An English surname turned first name; popularized as a girl's name ..."
"rainbow"
"little ruler, impulsive one"
"like a bird, birdlike"
"lily flower; pure"
"beautiful"
"life, living one"
"pamper me, take care of me"
"island"
"consecrated to God"
"graceful, beautiful"
"noble kind"
"lioness of God"
"oak tree, pool"
"vision of beauty"
Similar sound: These names share phonetic patterns with Lillian — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Lillian.
Rhythm: Lillian is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.