Total births
390
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.
- #6362
- among boys today
- 390
- born since 1998
- 2010s
- peak decade
- 55%
- more common than other boys
Castor currently ranks #6362 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 #6362 nationally today, ahead of 55% 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.
- #6362 among boys today
- 390 born since 1998
- 2010s peak decade
- 55% more common than other boys
Data updated Jun 2026
The verdict
Castor is currently the #6362 boys' name in America, more common than 55% of boys - 390 born since 1998, peaking in the 2010s.
- #6362
- among boys today
- 390
- born since 1998
- 2010s
- peak decade
- 55%
- more common than other boys
Castor vs. every other boys name in current SSA rankings
#6362
of 14,294 boys in use
More common than 55% of names given to boys today.
2010s
Peak decade
45% of everyone ever named Castor was born in this single decade.
2016
Single peak year
29 babies were named Castor in 2016 - its busiest year on record.
How Castor compares
390 Top 49% higher than 51% of 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
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 (Elchonon) | #1 boys name (Liam) |
|---|---|---|---|
| All-time total births | 390 | 367 | 358,536 |
| Peak-year births | 29 | 23 | 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 at a glance
Outside the top 1,000Peak year
2016
Current rank
#6,362
Active since
1998
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
Total births in each ten-year window, peak vs trough at a glance
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% |
California share of Castor's total US births 1.3%
Even split
5 of 390 births nationwide. Compared to a flat distribution across 2 reporting states.
Frequently Asked Questions
How popular is the name Castor? ▼
390 babies have been named Castor since 1998. It currently ranks #6362 among boys. The peak year was 2016 with 29 births.
When was Castor most popular? ▼
Castor was most popular in the 2010s decade with 176 total births. The single peak year was 2016.
Where is Castor most popular? ▼
The top states for the name Castor are California (5 births), Texas (5 births).
How long has the name Castor been used? ▼
Castor has been recorded in Social Security data since 1998, spanning 28 years of data through 2025.
What names are similar to Castor? ▼
Names with a similar sound or spelling include Casey, Cash, Cason, Case, and 4 more. These share a common prefix and are also used for boys.
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
- 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 Castor
Nearby Names Like Castor
Names with a similar sound, spelling, or feel to Castor
Casey Boy
#311 116,675 births
Cash Boy
#316 27,705 births
Cason Boy
#856 11,308 births
Case Boy
#724 9,926 births
Cassius Boy
#569 9,736 births
Compare Castor side by side: Castor vs Casey Castor vs Cash Castor vs Cason
Related Names
Names with a similar popularity rank to Castor
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, 1998–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Castor: #6362 Boys' Name - 390 Births, Peak 2016." NameAlmanac. Accessed via https://namealmanac.com/name/castor. 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 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 June 2026.