Millie is a girl name with a modern feel, drawn from real birth records.
| Country | Births on record |
|---|---|
| United States since 1880 | 46,138 births |
| England & Wales since 1996 | 43,971 births |
| Ireland since 1964 | 2,406 births |
Counts come from national birth registrations: the U.S. Social Security Administration, England & Wales (ONS) and Ireland (CSO). Coverage spans differ, so totals aren't directly comparable across countries.
Babies named Millie per year — United States (1880–2025). United States peaked in 2025 (3,353/yr) · England & Wales peaked in 2004 (2,421/yr) · Ireland peaked in 2022 (206/yr).
Millie reached its peak in 2025, when it was the #183 most popular baby name in the United States — making it a quintessential 2020s name.
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