Millie Girl
How popular is Millie?
#73 girl name in 2025
3,353 baby girls were named Millie in the US in 2025, making it the 73rd most popular girl name.
Millie popularity over time
Boys Girls
| Rank in 2025 | #73 for girls (▲ 14 from 2024) |
|---|---|
| Babies in 2025 | 3,353 girls |
| 10-year trend | Rising fast (+392% babies vs 2015) |
| Earlier ranks | #469 in 2015, #190 in 2020 |
| Peak year | 2025 (3,353 girls) |
| Highest rank | #73 in 2025 |
| First recorded | 1880 |
| Boys vs girls (last 10 years) | 0% boys, 100% girls |
| Chance a classmate shares it | 2% in a class of 25 kids born in 2025 |
Millie counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Millie family of names ranked #59 for girls in 2025 (#71 the year before), with 4,713 babies in all.
| Spelling | Girls in 2025 | Share |
|---|---|---|
| Millie | 3,353 | 71% |
| Miley | 900 | 19% |
| Milly | 113 | 2% |
| Mylee | 115 | 2% |
| Mylie | 58 | 1% |
| Myleigh | 54 | 1% |
| Milli | 33 | 1% |
| Millee | 24 | 1% |
| Mili | 19 | 0% |
| Mily | 9 | 0% |
| Milee | 8 | 0% |
| Mileigh | 9 | 0% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Where Millie is most popular
Babies named Millie per 1,000 girls born in each state, 2021 to 2025. Darker means more common.
- North Dakota: 6.7 per 1,000 (88 girls)
- Utah: 5.9 per 1,000 (487 girls)
- Montana: 5.5 per 1,000 (75 girls)
- Wyoming: 5.2 per 1,000 (22 girls)
- Idaho: 4.8 per 1,000 (160 girls)
Millie by decade
| Decade | Baby girls | Best rank |
|---|---|---|
| 1880s | 1,527 | #128 |
| 1890s | 1,959 | #169 |
| 1900s | 1,989 | #202 |
| 1910s | 4,123 | #245 |
| 1920s | 3,875 | #297 |
| 1930s | 2,607 | #366 |
| 1940s | 2,277 | #448 |
| 1950s | 1,932 | #566 |
| 1960s | 1,289 | #814 |
| 1970s | 741 | #1,125 |
| 1980s | 462 | #1,848 |
| 1990s | 472 | #2,335 |
| 2000s | 1,578 | #861 |
| 2010s | 6,860 | #240 |
| 2020s | 14,235 | #73 |
Girl names about as popular as Millie
Questions
- Is Millie a boy or girl name?
- Millie is mostly a girl name. Over the last 10 years, 100% of babies named Millie were girls.
- How popular is the name Millie?
- 3,353 baby girls were named Millie in the US in 2025, making it the 73rd most popular girl name.
- When was Millie most popular?
- Millie peaked in 2025, when 3,353 girls were given the name. Its highest rank was #73 in 2025.
- How many people are named Millie?
- 46,138 babies have been named Millie in the US since 1880. We estimate about 29,201 of them are alive in 2026, with a median age of 7.
- Where is Millie most popular?
- From 2021 to 2025, Millie was most common in North Dakota, at 6.7 of every 1,000 girls born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.