Total births
10
Boys' name · since 2017
Kastor
10 babies named Kastor in U.S. Social Security records since 2017, with the highest year being 2017. Year-by-year trend, decade aggregates, and state-level rankings drawn from federal birth data.
- 10
- total births
- 2017–2021
- years on record
- 2010s
- peak decade
- 50%
- born in that decade
Kastor is not among the current top-ranked boys names; 10 have been recorded since 2017.
Kastor has 10 recorded births among boys since 2017, per the U.S. Social Security Administration, though it falls outside today's most-used boys names, busiest in the 2010s -- see the year-by-year trends, decade totals, and state-level distribution below, all drawn directly from SSA birth-registration files spanning 2017 to 2021.
- 10 total births
- 2017–2021 years on record
- 2010s peak decade
- 50% born in that decade
Data updated Jul 2026
The verdict
10 boys have been named Kastor since 2017, peaking in the 2010s, last recorded in 2021.
- 10
- total births
- 2017–2021
- years on record
- 2010s
- peak decade
- 50%
- born in that decade
2010s
Peak decade
50% of everyone ever named Kastor was born in this single decade.
2017
Single peak year
5 babies were named Kastor in 2017 - its busiest year on record.
Kastor's usage pattern, beyond the headline number
Kastor splits its recorded history at 2021: 50% of all births land in the more recent half, 50% in the earlier half, an evenly balanced pattern over time. The single quietest year was 2017 (5 births).
Kastor at a glance
Last recorded 2021Peak year
2017
Current rank
Unranked
Active since
2017
Kastor popularity over time
Annual U.S. births registered with the Social Security Administration · 2017–2021
- Peak year (2017)
- 5
- Annual births at peak, across 5 years of records
Kastor by decade
Total births in each ten-year window, peak vs trough at a glance
2010s was Kastor's strongest decade.
5 babies received the name during that ten-year window, about 50% of all-time use.
Kastor births by decade
Total births in each ten-year window
- 2010s
2010s
5 births
- 2020s
2020s
5 births
What this shows Peak: 2010s at 5 births (50% of all-time use).
Frequently Asked Questions
How popular is the name Kastor? ▼
10 babies have been named Kastor since 2017. It was last recorded in 2021. The peak year was 2017 with 5 births.
When was Kastor most popular? ▼
Kastor was most popular in the 2010s decade with 5 total births. The single peak year was 2017.
How long has the name Kastor been used? ▼
The SSA has tracked Kastor since 2017 -- 5 years through the most recent 2021 data.
What names are similar to Kastor? ▼
Names with a similar sound or spelling include Kash, Kason, Kasey, Kasen, and 4 more. These share a common prefix and are also used for boys.
What to do with Kastor's data
- Kastor's usage has stayed within range of its 2010s decade-level peak (5 total births) through the 2020s (5) -- a comparatively stable name, not a fading trend.
- 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 Kastor
Nearby Names Like Kastor
Names with a similar sound, spelling, or feel to Kastor
Kash Boy
#293 17,367 births
Kason Boy
#567 14,904 births
Kasey Boy
#1162 12,623 births
Kasen Boy
#549 11,414 births
Kashton Boy
#395 7,658 births
Compare Kastor side by side: Kastor vs Kash Kastor vs Kason Kastor vs Kasey
Related Names
Names with a similar number of total births
Data Sources
Data as of July 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, 2017–2021 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Kastor: Baby Name Since 2017 - 10 Births, Peak 2017." NameAlmanac. Accessed via https://namealmanac.com/name/kastor. 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 Kastor 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 July 2026.