Girl Name
Milly
Milly is a girl's name whose meaning is not firmly attested in the historical record. It is used as a girl's name across several naming traditions, and it is rare in the United States today — outside the SSA top 1,000.
Milly is a girl baby name. It currently sits in the Rare tier of US baby names for 2026, and parents who love Milly often also consider Molly.
Milly meaning, origin, and usage
Meaning: Milly has a distinctive sound and evolving modern usage.
Origin: Multiple naming traditions are associated with this name.
Pronunciation: Baby Name Studio pronounces Milly as M·I·L·L·Y, with 5 letters and a girl usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Milly is an uncommon, standout choice in the Rare tier.
Milly variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Millya, Millye, Millyy, Mill.
- Nicknames: Mil and M.
- Middle names: Pair Milly with a middle name that balances its substantial sound; start with the Milly middle name generator.
- Sibling names: Molly, Miley, Mila, Millie, Maile — full picks on the sibling names for Milly guide for a cohesive sibset.
- Similar names: Looking for names that sound like Milly? Browse our names like Milly guide for phonetic-neighbor picks.
- Explore more: use the Baby Name Explorer, name search, AI name generator, and Baby Name Studio homepage.
Frequently asked about Milly
What does the name Milly mean?
Milly has no single meaning that is firmly attested in the historical record. It is used as a girl name in US birth records, and parents usually choose it for its sound rather than a documented meaning.
What is the origin of Milly?
The exact origin of Milly is debated, but it has been used across multiple naming traditions.
How do you pronounce Milly?
Milly has 5 letters and is most commonly stressed on the first syllable.
Is Milly a boy's or girl's name?
Milly is primarily used as a girl's name in US records.
How popular is Milly in 2026?
In our 2026 popularity tracker, Milly sits in the Rare tier — an uncommon, standout choice.
What names are similar to Milly?
Names that share Milly's sound and style include Molly, Miley, Mila, Millie, Maile.
What middle names pair well with Milly?
Good middle-name fits for Milly pair an opposite syllable rhythm: if Milly is short, lean longer (e.g. classical or three-syllable middles); if Milly is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Milly?
Sibling names that pair naturally with Milly share its rhythm without rhyming — Molly, Miley, Mila all sit comfortably alongside it on a shortlist.