Boy · #7,501 in 2026

Castor

Name: Popularity of the name Castor in U.S. births, 1880–2026
Creator: U.S. Social Security Administration
License: https://www.ssa.gov/foia/
Keywords: Castor, baby name, popularity, U.S., SSA, rankings

Current Rank

#7,501

Peak Rank

#3,681 (2016)

Total Babies

384

5-Yr Trend

-44%

1998

First Year

2026

Last Year

2016

Peak Year

#3681

Peak Rank

384

Total Count

Years Active

The Story of Castor

Castor first appeared in U.S. Social Security Administration records as a baby boy name in 1998, with 11 babies given the name that year. Its peak popularity came in 2016, when 29 Castors were born — ranking #3,681 that year. As of 2026, Castor ranks #7,501 for baby boys with 8 births, falling sharply (-44%). In total, more than 384 Castors have been born in the U.S. since records began in 1880, spanning the 1990s through the 2020s.

Popularity Over Time

Popularity by State

Top 10

11-50

51-100

101-500

500+

No data

Names that sound like Castor

Phonetically similar names — useful when Castor is the vibe but a different syllable count or letter feel might suit better. Linked entries have a profile on Peek a Name.

Caster
Kaster
Kastor
Coaster
Coster
Custer
Keester
Kester
Koster
Kister
Keaster
Koester

Source: Datamuse . Phonetic similarity ranking, not curated.

Frequently Asked Questions about Castor

What does the name Castor mean?

Castor is a boy's name that has been used in U.S. records since 1998. Behind the Name doesn't list a specific etymology, but the name has remained in use across multiple decades.

How popular is Castor in 2026?

In 2026, Castor ranks #7,501 among boys' names in the U.S., with 8 babies given the name that year.

When was Castor most popular?

Castor reached its peak popularity in 2016, ranking #3,681 that year with 29 babies given the name.

In which U.S. states is Castor most popular?

Castor has historically been most popular in Texas. Rankings vary year to year, but these states show the strongest concentration of births named Castor.

Is Castor a unisex name?

In U.S. Social Security records, Castor is primarily a boy's name. We don't have meaningful data for it as a girl's name.

What names go well with Castor?

Names that share a similar style or popularity range with Castor include Alray, Bolling, Claven. These pairings are based on rank proximity and naming era in U.S. data.

About the name Castor

Castor is a boy baby name tracked by the U.S. Social Security Administration. It first appeared in SSA records in 1998 and has accumulated 384 births in the dataset. Castor's peak popularity came in 2016 when it ranked #3,681. Use the chart and map above to compare Castor's trajectory across years and U.S. states, or browse the related names section to discover similar choices.

Continue exploring

Data sources

Birth statistics (counts, ranks, years 1880–2026) — U.S. Social Security Administration . Predictions for years not yet released by SSA are computed by Peek a Name from historical trends; we update with official data as soon as it ships.
Etymology, cultural origins, and related forms — Behind the Name (used under their public API terms).
Meaning prose and editorial summary — Wikipedia article extracts, licensed under CC BY-SA 3.0 .
Predicted nationality distribution — Nationalize.io .
Phonetically similar names — Datamuse .

Peek a Name aggregates and presents the above data for informational purposes. Statistical predictions and external attributions are clearly labelled where shown; we make no guarantee of accuracy beyond what each source provides.