Total births
550
Unisex name · since 1974
Rei
550 babies named Rei in U.S. Social Security records since 1974, with the highest year being 2020. Year-by-year trend, decade aggregates, and state-level rankings drawn from federal birth data.
- #4939
- among girls today
- 550
- born since 1974
- 2010s
- peak decade
- 72%
- more common than other girls
550 babies have been named Rei since 1974, making it today's #4939 unisex name.
According to the U.S. Social Security Administration, Rei has been recorded 550 times among girls since 1974, currently ranked #4939 nationally and more common than 72% of girls, with its heaviest use in the 2010s. This profile covers year-by-year birth trends, decade totals, and state-level distribution, all derived directly from SSA birth-registration files spanning 1974 to 2025.
- #4939 among girls today
- 550 born since 1974
- 2010s peak decade
- 72% more common than other girls
Data updated Jun 2026
The verdict
Rei is currently the #4939 unisex name in America, more common than 72% of girls - 550 born since 1974, peaking in the 2010s.
- #4939
- among girls today
- 550
- born since 1974
- 2010s
- peak decade
- 72%
- more common than other girls
Rei vs. every other girls name in current SSA rankings
#4939
of 17,726 girls in use
More common than 72% of names given to girls today.
2010s
Peak decade
39% of everyone ever named Rei was born in this single decade.
2020
Single peak year
48 babies were named Rei in 2020 - its busiest year on record.
How Rei compares
550 Top 43% higher than 57% of 17,726 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
Rei's all-time total is 44% above the median girls name, and Olivia still leads by a wide margin.
| Metric | Rei | Median girls name (Emerly) | #1 girls name (Olivia) |
|---|---|---|---|
| All-time total births | 550 | 382 | 567,345 |
| Peak-year births | 48 | 48 | 19,840 |
Rei's usage pattern, beyond the headline number
Splitting Rei's full recorded timeline at 2009, 74% of its total births fall in the more recent half of the record versus 26% in the earlier half -- usage has skewed toward the present, not a one-decade spike. Its quietest year on record was 1974, with just 5 recorded births -- worth weighing against the 2020 peak of 48 to see the full range of the name's swing in popularity.
Rei at a glance
Outside the top 1,000Peak year
2020
Current rank
#4,939
Active since
1974
Rei popularity over time - girls
Annual U.S. births registered with the Social Security Administration · 1974–2025
- Peak year (2020)
- 48
- Annual births at peak, across 52 years of records
Rei popularity over time - boys
478 total births recorded since 1987 (Rei as boys' name)
Rei by decade
Total births in each ten-year window, peak vs trough at a glance
2010s was Rei's strongest decade.
217 babies received the name during that ten-year window, about 39% of all-time use.
Rei births by decade
Total births in each ten-year window
- 1970s 5
1970s
5 births
- 1980s 20
1980s
20 births
- 1990s 27
1990s
27 births
- 2000s
2000s
101 births
- 2010s
2010s
217 births
- 2020s
2020s
180 births
What this shows Peak: 2010s at 217 births (39% of all-time use).
How Rei compares to similarly-sized names
Years in SSA records vs. share of all-time use concentrated in the single peak year, among 15 girls names closest to Rei's total volume
Rei vs 15 similarly-sized girls names
Rei by state
Where Rei concentrates geographically, total births since 1974
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | California | | 93 | 16.9% |
| #2 | New York | | 16 | 2.9% |
| #3 | Pennsylvania | | 5 | 0.9% |
| #4 | Texas | | 5 | 0.9% |
California share of Rei's total US births 16.9%
Even split
93 of 550 births nationwide. Compared to a flat distribution across 4 reporting states.
Frequently Asked Questions
How popular is the name Rei? ▼
550 babies have been named Rei since 1974. It currently ranks #4939 among girls. The peak year was 2020 with 48 births.
When was Rei most popular? ▼
Rei was most popular in the 2010s decade with 217 total births. The single peak year was 2020.
Where is Rei most popular? ▼
The top states for the name Rei are California (93 births), New York (16 births), Pennsylvania (5 births).
Is Rei a unisex name? ▼
Yes, Rei is used for both boys and girls. As a girl's name it has 550 births, and as a boy's name it has 478 births.
How long has the name Rei been used? ▼
Rei has been recorded in Social Security data since 1974, spanning 52 years of data through 2025.
What names are similar to Rei? ▼
Names with a similar sound or spelling include Reina, Reign, Reilly, Reita, and 4 more. These share a common prefix and are also used for girls.
What to do with Rei's data
- Rei's usage has stayed within range of its 2010s decade-level peak (217 total births) through the 2020s (180) -- a comparatively stable name, not a fading trend.
- California records the most Reis (93 births) -- see the full state breakdown if geography matters to your decision. California names
- Weighing it against an alternative? Put two names side by side. Compare names
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Rei
Nearby Names Like Rei
Names with a similar sound, spelling, or feel to Rei
Reina Girl
#552 14,080 births
Reign Girl
#435 7,989 births
Reilly Girl
#2709 5,528 births
Reita Girl
1,364 births
Reid Girl
#4491 992 births
Compare Rei side by side: Rei vs Reina Rei vs Reign Rei vs Reilly
Related Names
Names with a similar popularity rank to Rei
Data Sources
Data as of June 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, 1974–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Rei: #4939 Unisex Name - 550 Births, Peak 2020." NameAlmanac. Accessed via https://namealmanac.com/name/rei. Licensed CC BY-SA 4.0.
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 Rei 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 June 2026.