Unisex name · since 1942
Day
Since 1942, U.S. Social Security records show 166 babies named Day, peaking in 1973. See the year-by-year trend, decade totals, and state rankings below, sourced from federal birth data.
- #21,707 of 72,339
- all-time among girls
- #15,153 of 17,297
- 2025 SSA year
- 166
- born since 1942
- 1970s
- peak decade
Yes -- Day is the #15153 most popular unisex name in the U.S. today, with 166 recorded since 1942.
Social Security Administration records show Day recorded 166 times among girls since 1942, holding rank #15153 nationally today, ahead of 12% of girls, peaking in the 1970s. This profile derives year-by-year birth trends, decade totals, and state-level distribution directly from SSA birth-registration files spanning 1942 to 2025.
- #21,707 of 72,339 all-time among girls
- #15,153 of 17,297 2025 SSA year
- 166 born since 1942
- 1970s peak decade
Data updated Aug 2026
The verdict
According to the U.S. Social Security Administration, Day ranks #21,707 of 72,339 girls' names by all-time recorded births (highest first) and #15,153 of 17,297 among girls' names in 2025. 166 born since 1942, peaking in the 1970s.
- #21,707 of 72,339
- all-time among girls
- #15,153 of 17,297
- 2025 SSA year
- 166
- born since 1942
- 1970s
- peak decade
Day's 166 recorded births place it above 69.92% of the 72,339 girls names in the full SSA archive.
No state rows cleared SSA’s public reporting threshold for this name.
How Day compares
166 33rd percentile among 17,297 names currently given to girls
Based on all-time total births among currently-ranked girls names. Names with fewer occurrences are grouped into wider buckets on the right.
Source U.S. Social Security Administration, national baby name data
How the numbers stack up
Day's all-time total is 56% below the median girls name, and Olivia still leads by a wide margin.
| Metric | Day | Median girls name (Kyann) | #1 girls name (Olivia) |
|---|---|---|---|
| All-time total births | 166 | 376 | 567,345 |
| Peak-year births | 12 | 21 | 19,840 |
Day's usage pattern, beyond the headline number
Splitting Day's full recorded timeline at 1991, 43% of its total births fall in the more recent half of the record versus 57% in the earlier half -- a fairly even split across the full record. Its quietest year on record was 1966, with just 5 recorded births -- worth weighing against the 1973 peak of 12 to see the full range of the name's swing in popularity.
Day popularity over time - girls
Annual U.S. births registered with the Social Security Administration · 1942–2025
- Peak year (1973)
- 12
- Annual births at peak, across 84 years of records
Day popularity over time - boys
142 total births recorded since 1915 (Day as boys' name)
Day by decade
1970s is the heaviest window (74 births, 45% of the file).
1970s was Day's strongest decade.
74 babies received the name during that ten-year window, about 45% of all-time use.
Day births by decade
Total births in each ten-year window
- 1940s 6
1940s
6 births
- 1950s 10
1950s
10 births
- 1960s 5
1960s
5 births
- 1970s
1970s
74 births
- 1990s 5
1990s
5 births
- 2000s 17
2000s
17 births
- 2010s
2010s
31 births
- 2020s 18
2020s
18 births
What this shows Peak: 1970s at 74 births (45% of all-time use).
Frequently Asked Questions
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What to do with Day's data
- Day's decade-level peak was the 1970s (74 total births); usage has since declined to 18 in the 2020s -- if you're weighing a "classic revival" angle, the trend line argues against it.
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Day
Nearby Names Like Day
Names with a similar sound, spelling, or feel to Day
Compare Day side by side: Day vs Dayana Day vs Dayna Day vs Dayanara
Related Names
Names with a similar popularity rank to Day
Nationwide names with similar peak year or record span
Two nationwide peer axes for Day: closest SSA peak year, and closest first→latest record span. Distinct from the spelling and current-rank neighborhoods above.
Similar peak year (~1973)
Similar record span (~83 yrs)
Peak year is the single SSA year with the most births for that name; record span is first-to-latest year in the national files, not a recommendation or shared origin claim.
Data Sources
Data as of August 2026. Source: U.S. Social Security Administration (SSA).
According to the Social Security Administration, this profile draws directly from the agency's public-use baby-name files (updated June 2026). See our methodology for the full extraction, aggregation, and privacy-suppression rules.
Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications, National Data, 1942–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Name Almanac is rendered directly from the Social Security Administration's public baby-name files, no number is typed in by an editor. This profile for Day draws directly on SSA national and state-level files, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.