Romaine sits next to 3 phonetic neighbors — Lorraine, Elaine, and Romina are the closest matches by sound. Most share Romaine's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of Rome, Roman woman"
"luminous, shining (via Lucinda)"
"flowing, moving freely"
"to soothe, to comfort"
"prosperous friend"
"shepherd, friend"
"settlement of the Britons"
"little light"
"horn, strength"
"champion"
"narcissus flower, sleep-inducing"
"the white, noble one"
"fortress city, military camp"
"gentle, mild"
"bright, famous"
Similar sound: These names share phonetic patterns with Romaine — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin via French origins, giving them the same cultural heritage as Romaine.
Rhythm: Romaine is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.