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.
- #15,374 of 45,481
- all-time among boys
- #11,382 of 13,930
- 2025 SSA year
- 137
- born since 2005
- 2010s
- peak decade
Yes -- Kaisei is the #11382 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 #11382 nationally today, ahead of 18% 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.
- #15,374 of 45,481 all-time among boys
- #11,382 of 13,930 2025 SSA year
- 137 born since 2005
- 2010s peak decade
Data updated Aug 2026
The verdict
According to the U.S. Social Security Administration, Kaisei ranks #15,374 of 45,481 boys' names by all-time recorded births (highest first) and #11,382 of 13,930 among boys' names in 2025. 137 born since 2005, peaking in the 2010s.
- #15,374 of 45,481
- all-time among boys
- #11,382 of 13,930
- 2025 SSA year
- 137
- born since 2005
- 2010s
- peak decade
Kaisei's 137 recorded births place it above 66.15% of the 45,481 boys names in the full SSA archive.
The state file records this name in 1 jurisdictions, led by California.
How Kaisei compares
137 31st percentile among 13,930 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 (Takari) | #1 boys name (Liam) |
|---|---|---|---|
| All-time total births | 137 | 369 | 358,536 |
| Peak-year births | 10 | 34 | 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 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
2010s is the heaviest window (70 births, 51% of the file).
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% |
5 of 137 births nationwide.
Frequently Asked Questions
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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
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
Compare Kaisei side by side: Kaisei vs Kai Kaisei vs Kaiden Kaisei vs Kairo
Related Names
Names with a similar popularity rank to Kaisei
Nationwide names with similar peak year or record span
Two nationwide peer axes for Kaisei: closest SSA peak year, and closest first→latest record span. Distinct from the spelling and current-rank neighborhoods above.
Similar peak year (~2007)
Similar record span (~20 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, 2005–2025 (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 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 August 2026.