Millie
Millie was the 73rd most popular name for girls in 2025, given to 3,353 babies. That is its highest rank since records began in 1880. Over the last ten years it has moved up 396 places. More babies were named Millie in the 2020s than in any other decade.
Meaning pet form of Mildred, Millicent, Emily, Amelia and others · English
Say it MIL-ee /ˈmɪli/
- Rank in 2025
- #73 girls, up 117 places since 2020
- Babies in 2025
- 3,353girls
- Girls and boys
- Almost always a girl’s name2021–2025
- Peak year
- 20253,353 babies
- Total since 1880
- 46,138babies recorded
What does the name Millie mean?
Millie is a pet form of several names, and Wiktionary lists Mildred, Millicent, Emily, Amelia and Camilla; Wikipedia gives a similar list. It is now also given as a full name. Its meaning depends on the parent name: Mildred, for example, is Old English for 'mild strength' according to DMNES, while Emily goes back to the Roman family name Aemilius. Families who choose Millie on its own often do not have a single source in mind.
mild (Old English, “mild, gentle (in Mildred)”)þrȳþ (Old English, “strength (in Mildred)”)
How sure is this? Well established.
Related names: Milly, Mildred, Millicent, Emily, Amelia, Camilla.
See also: English names.
Sources for this meaning
- Wiktionary, entry 'Millie', Wiktionary (Wikimedia Foundation); facts restated, no text reused
- Wikipedia, 'Millie', Wikipedia (Wikimedia Foundation); facts restated, no text reused
- Dictionary of Medieval Names from European Sources, ed. S. L. Uckelman, Edition 2023 no. 1, s.v. 'Mildred', Durham University / The DMNES Editors
Millie popularity since 1880
A few boys are given the name too: 212 since 1907.
| Year | Rank (girls) | Babies (girls) |
|---|---|---|
| 2025 | #73 | 3,353 |
| 2020 | #190 | 1,504 |
| 2010 | #861 | 311 |
| 2000 | #2,008 | 83 |
| 1990 | #2,629 | 45 |
| 1980 | #2,001 | 53 |
| 1970 | #1,194 | 96 |
| 1960 | #830 | 156 |
| 1950 | #624 | 184 |
| 1940 | #448 | 232 |
| 1930 | #411 | 257 |
| 1920 | #298 | 478 |
| 1910 | #245 | 247 |
| 1900 | #209 | 229 |
| 1890 | #170 | 204 |
| 1880 | #145 | 105 |
How popular is Millie, counting every spelling?
Millie is the most common spelling of a name family that ranked #80 for girls in 2025 once every spelling is counted together, compared with #73 for Millie on its own. Together these spellings went to 3,611 girls in 2025.
| Spelling | Babies 2025 | Official rank | Babies 2021–2025 |
|---|---|---|---|
| Millie | 3,353 | #73 | 12,731 |
| Milly | 113 | #1,790 | 570 |
| Milli | 33 | #4,321 | 154 |
| Millee | 24 | #5,348 | 119 |
| Mili | 19 | #6,258 | 91 |
| Myleah | 15 | #7,387 | 67 |
| Mily | 9 | #10,646 | 60 |
| Mileah | 8 | #11,594 | 53 |
| Milee | 8 | #11,595 | 38 |
| Milea | 12 | #8,695 | 25 |
Spellings count together when they sound the same in American English and are used for the same sex; nicknames and forms that sound different (such as Theo and Theodore) are kept apart. How we group spellings.
How many kids will share the name Millie?
3,353 of the 3,606,400 babies born in the US in 2025 were named Millie (0.93 per 1,000 births). For a girl named Millie born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 3 (of 430 pupils) would have a child named Millie.
Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.
How old are people named Millie?
About 28,600 people born in the US named Millie are alive today, with a median age of 7; half are between 3 and 18. That makes Millie a young name: most people with it are children.
Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.
Millie by state
How common Millie was among girls born in each state in 2021–2025. It is notably more common than nationally in North Dakota (4.3×), Utah (3.7×), Montana (3.5×), Wyoming (3.3×), Idaho (3.0×). It is least common, relative to the national rate, in New Jersey, New Mexico, District of Columbia.
Names with a similar history
These names rose and fell in step with Millie: their share of US girls followed the most similar curve since 1880. If you like Millie, they share its era and feel.
Middle names for Millie · Sibling names for Millie
Millie is also a nickname for Amelia, Emilia, Emily, Camille, Emelia, Amelie and Mildred.
Questions about the name Millie
What does Millie mean?
Millie means “pet form of Mildred, Millicent, Emily, Amelia and others” (English origin). Certainty: well established.
How popular is the name Millie?
Millie was the 73rd most popular name for girls in 2025, given to 3,353 babies. That is its highest rank since records began in 1880. Over the last ten years it has moved up 396 places. More babies were named Millie in the 2020s than in any other decade.
Is Millie a boy or girl name?
In 2021–2025, almost always a girl’s name given the name Millie in the US.
Where is Millie most popular?
In 2021–2025, Millie was most common in North Dakota (6.70 per 1,000 girls), followed by Utah and Montana.