Baby Names US
Unisex name ★ peaked 1975

Day

Gender Unisex · 54% girls Rank 2025 #15,481

A surname originating as a patronymic derived from a medieval diminutive of David.

Rank 2025
#15,481
among girls
Babies in 2025
11
named Day
How common
1 in 321,453
girls born in 2025
Peak year
1975
15 babies
All-time total
308
#16,586 all-time among girls
First recorded
1915
in Social Security records

Day popularity over time

308 babies have been named Day since 1915, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure
Births per 1,000 babies of that sex, comparable across eras
00.010.010.0118801900192019401960198020002020BoysGirls
BoysGirls

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade Girls Boys Total Per year Change Best rank
1880s – – – – – –
1890s – – – – – –
1900s – – – – – –
1910s – 17 17 2 – –
1920s – 19 19 2 +12% –
1930s – 12 12 1 -37% –
1940s 6 20 26 3 +117% #4,226
1950s 10 6 16 2 -38% #3,836
1960s 5 11 16 2 0% #6,797
1970s 74 19 93 9 +481% #4,621
1980s – 10 10 1 -89% –
1990s 5 6 11 1 +10% #13,687
2000s 17 5 22 2 +100% #13,964
2010s 31 5 36 4 +64% #13,252
2020s (to 2025) 18 12 30 5 +39% #11,462

The story of Day

Day is rare for girls in the United States, ranked #15,481 in 2025 with 5 babies given the name. It is currently declining compared with a decade ago.

Since 1915, 308 American babies have been named Day, about 54% girls and 46% boys, making it a genuinely unisex name. Its peak came in 1975, when 15 newborns received the name, the signature sound of the 1970s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Day stood among all girls' names in any year, or use the compare tool to plot it against other names.

How old are people named Day?

The median living Day is about 48 years old; half are between 13 and 54. An estimated 200 people named Day are alive in the United States today.

median 48 020406080100

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Day year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year Girls Girls rank Boys Boys rank
2025 5 #15,481 6 #10,966
2024 – – – –
2023 – – – –
2022 8 #11,462 6 #11,186
2021 – – – –
2020 5 #15,701 – –
2019 – – – –
2018 – – – –
2017 6 #14,575 – –
2016 7 #13,252 – –
2015 – – 5 #12,507
2014 7 #13,428 – –
2013 – – – –
2012 6 #15,442 – –
2011 – – – –
2010 5 #17,678 – –
2009 – – 5 #12,918
2008 – – – –
2007 6 #15,998 – –
2006 – – – –
2005 – – – –
2004 – – – –
2003 – – – –
2002 – – – –
2001 6 #13,964 – –
2000 5 #15,643 – –
1995 – – 6 #8,030
1990 – – – –
1985 – – – –
1980 – – – –
1975 8 #6,635 7 #4,421
1970 7 #6,491 5 #4,867
1965 – – 6 #3,617
1960 – – – –
1955 10 #3,836 – –
1950 – – – –
1945 – – – –
1940 – – 5 #3,561
1935 – – – –
1930 – – – –
1925 – – 7 #3,484
1920 – – 5 #4,451
1915 – – 6 #3,496
1910 – – – –
1905 – – – –
1900 – – – –
1895 – – – –
1890 – – – –
1885 – – – –
1880 – – – –

Frequently asked questions

Quick answers about Day, drawn from the same Social Security data as the charts above.

How old is the average Day?

The median living Day is about 48 years old. Half of all living Days are between 13 and 54 years old.

How many people named Day are alive today?

An estimated 200 people named Day are alive in the United States, based on 308 recorded births and Social Security life tables.

What does the name Day mean?

A surname originating as a patronymic derived from a medieval diminutive of David.

How popular is the name Day in 2025?

Day ranked #15,481 among girls' names in the United States in 2025, with 5 babies given the name, according to Social Security Administration data.

How many people are named Day?

308 babies have been named Day in the United States since 1915, based on Social Security card applications.

When was the name Day most popular?

Day peaked in 1975, when 15 newborns received the name.

Is Day a boy or girl name?

Day is used for both: about 54% of babies named Day have been girls and 46% boys.

Is the name Day rising or falling?

Day is declining, less popular now than a decade ago.

Names like Day

Names that sound and feel close to Day: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Day with similar names → More names starting with D →