Milly sits next to 4 phonetic neighbors — Millie, Molly, and Lily are the closest matches by sound. Most share Milly's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"strength in work, industrious"
"violent weather, tempest"
"pinkish-orange color of the sea"
"entire, complete"
"crown of laurel"
"from the hollow, dweller in the hollow"
"fair phantom, white wave"
"the calming sky"
"beloved, cherished"
"youthful, downy-bearded"
"God is gracious"
"unconquerable, invincible"
"fate, destiny"
"the Lord is my God"
"from the heathered meadow (as short for Hadley)"
"strong, manly (via Andrew from Greek Andreas)"
"star sun"
"priest's meadow"
"little dear"
"shade, shadow"
"steadfast, constant, unwavering"
Similar sound: These names share phonetic patterns with Milly — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Milly.
Rhythm: Milly is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.