Boys' name · since 1998
Castor
390 babies named Castor in U.S. Social Security records since 1998, with the highest year being 2016. Year-by-year trend, decade aggregates, and state-level rankings drawn from federal birth data.
- #9,160 of 45,481
- all-time among boys
- #4,805 of 13,930
- 2025 SSA year
- 390
- born since 1998
- 2010s
- peak decade
Castor currently ranks #4805 among boys' names in America, with 390 babies recorded since 1998.
Social Security Administration records show Castor recorded 390 times among boys since 1998, holding rank #4805 nationally today, ahead of 66% 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 1998 to 2025.
- #9,160 of 45,481 all-time among boys
- #4,805 of 13,930 2025 SSA year
- 390 born since 1998
- 2010s peak decade
Data updated Aug 2026
The verdict
According to the U.S. Social Security Administration, Castor ranks #9,160 of 45,481 boys' names by all-time recorded births (highest first) and #4,805 of 13,930 among boys' names in 2025. 390 born since 1998, peaking in the 2010s.
- #9,160 of 45,481
- all-time among boys
- #4,805 of 13,930
- 2025 SSA year
- 390
- born since 1998
- 2010s
- peak decade
Castor's 390 recorded births place it above 79.83% of the 45,481 boys names in the full SSA archive.
The state file records this name in 2 jurisdictions, led by California.
How Castor compares
390 Top 49% higher than 51% of 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
Castor's all-time total is 6% above the median boys name, and Liam still leads by a wide margin.
| Metric | Castor | Median boys name (Takari) | #1 boys name (Liam) |
|---|---|---|---|
| All-time total births | 390 | 369 | 358,536 |
| Peak-year births | 29 | 34 | 22,252 |
Castor's usage pattern, beyond the headline number
Divide Castor's SSA record in two at 2012 and the more recent half accounts for 67% of all births, the earlier half the remaining 33%, consistent with a name still gaining ground rather than fading. Its calmest year was 2004, with only 6 births recorded -- set against the 2016 peak of 29, that's the full swing in one name's fortunes.
Castor popularity over time
Annual U.S. births registered with the Social Security Administration · 1998–2025
- Peak year (2016)
- 29
- Annual births at peak, across 28 years of records
Castor by decade
2010s is the heaviest window (176 births, 45% of the file).
2010s was Castor's strongest decade.
176 babies received the name during that ten-year window, about 45% of all-time use.
Castor births by decade
Total births in each ten-year window
- 1990s 19
1990s
19 births
- 2000s
2000s
89 births
- 2010s
2010s
176 births
- 2020s
2020s
106 births
What this shows Peak: 2010s at 176 births (45% of all-time use).
Castor by state
Where Castor concentrates geographically, total births since 1998
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | California | | 5 | 1.3% |
| #2 | Texas | | 5 | 1.3% |
5 of 390 births nationwide. Compared to a flat distribution across 2 reporting states.
Frequently Asked Questions
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What to do with Castor's data
- Castor's usage has stayed within range of its 2010s decade-level peak (176 total births) through the 2020s (106) -- a comparatively stable name, not a fading trend.
- California records the most Castors (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 Castor
Nearby Names Like Castor
Names with a similar sound, spelling, or feel to Castor
Compare Castor side by side: Castor vs Casey Castor vs Cash Castor vs Cason
Related Names
Names with a similar popularity rank to Castor
Nationwide names with similar peak year or record span
Two nationwide peer axes for Castor: closest SSA peak year, and closest first→latest record span. Distinct from the spelling and current-rank neighborhoods above.
Similar peak year (~2016)
Similar record span (~27 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, 1998–2025 (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 Castor 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.