Milli sits next to 5 phonetic neighbors — Millie, Lily, and Billie are the closest matches by sound. Most share Milli's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"gentle strength"
"cheerful, joyful"
"crowned with laurel, victorious"
"old stone place"
"dew of the sea"
"estate of the fifth son"
"ugly head (archaic literal meaning)"
"murmuring rock (from the Rhine)"
"sea-colored, deep blue"
"gentle, maternal"
"jade stone and lake/pool"
"heavenly one from Delhi, divine and royal"
"active, energetic"
"graceful, noble"
"crooked nose, winding river bend"
"gracious, gentle"
"little fire, little fiery one"
"benevolent reason or principle"
"slender, fair"
"valiant, courageous"
"royal child of heaven"
Similar sound: These names share phonetic patterns with Milli — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Milli.
Rhythm: Milli is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.