Girls' name · peaked in 2025
Millie name popularity since 1925
34,186 babies born in the US from 1925 to 2025 were named Millie. Half of them were born in 2017 or earlier, so the typical Millie is about 9 years old in 2026. Millie peaked in 2025 as the #73 name for girls, and it ranked #73 in 2025.
Key facts
- US babies since 1925
- 34,186
- Named Millie, 1925–2025
- In 2025
- #73
- for girls in 2025 (3,353 babies)
- Girls / boys
- 99.8% girls
- 34,107 girls · 79 boys
- Most popular in
- Utah
- 3.71× its national share
Peak year is the year Millie made up the largest share of US girls, in records going back to 1880. Typical age is based on births from 1925 on, not on who is living today.
Millie births per year, 1925–2025
2025 was the biggest year for Millie both by count and as a share of all babies.
- Steepest fall: Between 1945 and 1950, Millie's share of baby girls fell by 36%, from 1 in 5,910 to 1 in 9,310.
- Fastest rise: Between 2007 and 2012, it became 2.8× more common, from 1 in 12,700 baby girls to 1 in 4,570.
Shaded on the chart. Both compare Millie's share of all US girls five years apart, counting only years with at least 100 babies named Millie.
Decade by decade
Babies named Millie in each decade, and its rank among girls' names in the middle year of the decade (1935, 1945 … 2025).
| Decade | Girls | Boys | Rank |
|---|---|---|---|
| 1925–29 | 1,654 | 43 | – |
| 1930s | 2,607 | 26 | #385 |
| 1940s | 2,277 | 5 | #488 |
| 1950s | 1,932 | 0 | #704 |
| 1960s | 1,289 | 0 | #837 |
| 1970s | 741 | 0 | #1,395 |
| 1980s | 462 | 0 | #2,526 |
| 1990s | 472 | 0 | #2,830 |
| 2000s | 1,578 | 0 | #1,562 |
| 2010s | 6,860 | 0 | #469 |
| 2020–25 | 14,235 | 5 | #73 |
Ranks count every name given to at least 5 girls that year, so they can go past 1,000.
Generation fingerprint
58.7% of babies named Millie from 1925 to 2025 were born in the Gen Alpha years (2013–2025). The full split by generation:
Where Millie is most popular
The index compares Millie's share of babies in each state with its share nationwide, 1925–2025 (1.50× = 50% more common). States with at least 300 babies named Millie.
| State | Index | Babies |
|---|---|---|
| Utah | 3.71× | 963 |
| Alabama | 2.15× | 1,156 |
| Mississippi | 2.04× | 754 |
| South Carolina | 1.94× | 829 |
| Arkansas | 1.92× | 601 |
Other spellings
Spellings that sound like Millie and were given to at least 1,000 girls from 1925 to 2025, with the year each one was most popular.
| Spelling | Girls | Peak year |
|---|---|---|
| Millie (this page) | 34,107 | 2025 |
| Miley | 15,683 | 2008 |
| Milly | 3,082 | 1884 |
Names with a similar story
Of the other 1999 names on this site, these six had the share of babies closest in shape to Millie's from 1925 to 2025, however common each one got. Each line is scaled to its own high; the dashed line is Millie.
Names from the same era
Other common names that peaked within two years of Millie (2025).
Source: U.S. Social Security Administration national and state baby-name data, which covers names given to at least 5 babies of one sex in a year. About the data