Total births
137
Boys' name · since 2005
Kaisei
137 babies named Kaisei in U.S. Social Security records since 2005, with the highest year being 2007. Year-by-year trend, decade aggregates, and state-level rankings drawn from federal birth data.
- #8748
- among boys today
- 137
- born since 2005
- 2010s
- peak decade
- 39%
- more common than other boys
Yes -- Kaisei is the #8748 most popular boys' name in the U.S. today, with 137 recorded since 2005.
Social Security Administration records show Kaisei recorded 137 times among boys since 2005, holding rank #8748 nationally today, ahead of 39% of boys, peaking in the 2010s. This profile derives year-by-year birth trends, decade totals, and state-level distribution directly from SSA birth-registration files spanning 2005 to 2025.
- #8748 among boys today
- 137 born since 2005
- 2010s peak decade
- 39% more common than other boys
Data updated Jun 2026
The verdict
Kaisei is currently the #8748 boys' name in America, more common than 39% of boys - 137 born since 2005, peaking in the 2010s.
- #8748
- among boys today
- 137
- born since 2005
- 2010s
- peak decade
- 39%
- more common than other boys
Kaisei vs. every other boys name in current SSA rankings
#8748
of 14,294 boys in use
More common than 39% of names given to boys today.
2010s
Peak decade
51% of everyone ever named Kaisei was born in this single decade.
2007
Single peak year
10 babies were named Kaisei in 2007 - its busiest year on record.
How Kaisei compares
137 31th percentile among 14,294 names currently given to boys
Based on all-time total births among currently-ranked boys 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
Kaisei's all-time total is 63% below the median boys name, and Liam still leads by a wide margin.
| Metric | Kaisei | Median boys name (Elchonon) | #1 boys name (Liam) |
|---|---|---|---|
| All-time total births | 137 | 367 | 358,536 |
| Peak-year births | 10 | 23 | 22,252 |
Kaisei's usage pattern, beyond the headline number
Divide Kaisei's SSA record in two at 2015 and the more recent half accounts for 51% of all births, the earlier half the remaining 49%, a genuinely balanced usage pattern. Its calmest year was 2005, with only 5 births recorded -- set against the 2007 peak of 10, that's the full swing in one name's fortunes.
Kaisei at a glance
Outside the top 1,000Peak year
2007
Current rank
#8,748
Active since
2005
Kaisei popularity over time
Annual U.S. births registered with the Social Security Administration · 2005–2025
- Peak year (2007)
- 10
- Annual births at peak, across 21 years of records
Kaisei by decade
Total births in each ten-year window, peak vs trough at a glance
2010s was Kaisei's strongest decade.
70 babies received the name during that ten-year window, about 51% of all-time use.
Kaisei births by decade
Total births in each ten-year window
- 2000s
2000s
33 births
- 2010s
2010s
70 births
- 2020s
2020s
34 births
What this shows Peak: 2010s at 70 births (51% of all-time use).
Kaisei by state
Where Kaisei concentrates geographically, total births since 2005
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | California | | 5 | 3.6% |
California share of Kaisei's total US births 3.6%
5 of 137 births nationwide.
Frequently Asked Questions
How popular is the name Kaisei? ▼
Since 2005, Social Security records show 137 babies named Kaisei. Today it holds rank #8748 among boys. Its busiest year on record was 2007, with 10 births.
When was Kaisei most popular? ▼
Kaisei was most popular in the 2010s decade with 70 total births. The single peak year was 2007.
Where is Kaisei most popular? ▼
The top states for the name Kaisei are California (5 births).
How long has the name Kaisei been used? ▼
The SSA has tracked Kaisei since 2005 -- 21 years through the most recent 2025 data.
What names are similar to Kaisei? ▼
Names with a similar sound or spelling include Kai, Kaiden, Kairo, Kaison, and 4 more. These share a common prefix and are also used for boys.
What to do with Kaisei's data
- Kaisei's usage has stayed within range of its 2010s decade-level peak (70 total births) through the 2020s (34) -- a comparatively stable name, not a fading trend.
- California records the most Kaiseis (5 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 Kaisei
Nearby Names Like Kaisei
Names with a similar sound, spelling, or feel to Kaisei
Kai Boy
#76 70,232 births
Kaiden Boy
#208 52,562 births
Kairo Boy
#238 11,224 births
Kaison Boy
#515 7,182 births
Kaiser Boy
#801 3,921 births
Compare Kaisei side by side: Kaisei vs Kai Kaisei vs Kaiden Kaisei vs Kairo
Related Names
Names with a similar popularity rank to Kaisei
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, 2005–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Kaisei: #8748 Boys' Name - 137 Births, Peak 2007." NameAlmanac. Accessed via https://namealmanac.com/name/kaisei. 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 Kaisei 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.