girl name
Millie
Gender
Girl
Popularity
#73 · U.S. girls (2025)
Popularity of Millie in the US, 1880–2025
Millie first appears in US records in 1880. It peaked in 2025, when 3,353 girls were given the name; in 2025 there were 3,353.
Source: US Social Security Administration.
Frequently asked questions
Is Millie a boy or a girl name?
Millie is most commonly used as a girl name.
How popular is the name Millie?
In 2025, Millie ranked #73 among girls’ names in the United States, according to U.S. Social Security Administration data.
When was the name Millie most popular?
Millie was most popular in 2025, when about 3,353 US babies were given the name that year, according to US Social Security Administration records.