How Many People Are Named Day?
An estimated 221 people in the United States have the first name Day. It is used for both genders, with 54.2% female. The average bearer is 41 years old, and Day peaked in popularity in 1975 with 15 births that year.
Below you will find a full statistical profile of Day as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Day paired with any surname.
Estimated Living Americans
221
About 1 in 1,550,925 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
54.2% confidence
Average Age
41
years old
Peak Year
1975
15 births
Total Registered
297
since 1880
Gender Distribution for Day
Day is a genuinely unisex name, used for both males (45.8%) and females (54.2%). Out of 297 total births registered, 136 were male and 161 were female.
Day as a male name
Ranked #11,182 in 2022
6 male births in 2022
Peak: 1922 (7 births)
Day as a female name
Ranked #11,456 in 2022
8 female births in 2022
Peak: 1973 (12 births)
Day: Popularity Over Time
SSA records for Day span from the 1910s to the 2020s, covering 12 decades of naming data. The most popular decade for this name was the 1970s, when 93 babies were registered. Day has declined significantly from its peak in the 1970s. Recent registrations are a fraction of what they were at the name's height.
Day by Decade
How has Day tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Day + Last Name Combinations
How many people share a full name with Day as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Day
Other first names starting with D with a similar number of bearers.
Day: Questions and Answers
How many people in the U.S. are named Day?
We estimate approximately 221 people named Day are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 1,550,925 Americans share this first name.
Is Day a common name?
Day is classified as "Very Rare" and is more popular than 75.5% of all first names in the SSA database. A total of 297 births have been registered with this name since 1880.
When was Day most popular?
Day reached peak popularity in 1975, when 15 babies were given this name. The average age of a living person named Day is approximately 41 years old, reflecting when the name was most commonly given.
Is Day a female name?
Day is predominantly female. 54.2% of people with this name are female. See the gender breakdown above for full details.
How many Day Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Day Smith, Day Johnson, Day Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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