Castor
Every Castor since 1998 — 390 of them. Popularity, births, and rankings for each year, from official Social Security records.
The story of Castor
Castor is rare for boys in the United States, ranked #4,734 in 2025 with 21 babies given the name. It is currently holding steady compared with a decade ago.
Since 1998, 390 American babies have been named Castor. Its peak came in 2016, when 29 newborns received the name — the signature sound of the 2010s.
The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Castor stood among all boys' names in any year, or use the compare tool to plot it against other names.
Castor year by year
Every year since 2001, and five-year steps back to 1880. Rank is within each sex.
| Year | Boys | Boys rank |
|---|---|---|
| 2025 | 21 | #4,734 |
| 2024 | 14 | #6,245 |
| 2023 | 11 | #7,363 |
| 2022 | 17 | #5,475 |
| 2021 | 17 | #5,375 |
| 2020 | 26 | #3,941 |
| 2019 | 23 | #4,353 |
| 2018 | 24 | #4,251 |
| 2017 | 14 | #6,100 |
| 2016 | 29 | #3,702 |
| 2015 | 17 | #5,336 |
| 2014 | 18 | #5,095 |
| 2013 | 17 | #5,201 |
| 2012 | 15 | #5,758 |
| 2011 | 10 | #7,598 |
| 2010 | 9 | #8,253 |
| 2009 | 13 | #6,491 |
| 2008 | 8 | #9,134 |
| 2007 | 8 | #9,046 |
| 2006 | 11 | #6,985 |
| 2005 | 9 | #7,730 |
| 2004 | 6 | #10,165 |
| 2003 | 7 | #8,802 |
| 2002 | 8 | #7,757 |
| 2001 | 9 | #7,010 |
| 2000 | 10 | #6,385 |
| 1995 | — | — |
| 1990 | — | — |
| 1985 | — | — |
| 1980 | — | — |
| 1975 | — | — |
| 1970 | — | — |
| 1965 | — | — |
| 1960 | — | — |
| 1955 | — | — |
| 1950 | — | — |
| 1945 | — | — |
| 1940 | — | — |
| 1935 | — | — |
| 1930 | — | — |
| 1925 | — | — |
| 1920 | — | — |
| 1915 | — | — |
| 1910 | — | — |
| 1905 | — | — |
| 1900 | — | — |
| 1895 | — | — |
| 1890 | — | — |
| 1885 | — | — |
| 1880 | — | — |
Frequently asked questions
How popular is the name Castor in 2025?
Castor ranked #4,734 among boys' names in the United States in 2025, with 21 babies given the name, according to Social Security Administration data.
How many people are named Castor?
390 babies have been named Castor in the United States since 1998, based on Social Security card applications.
When was the name Castor most popular?
Castor peaked in 2016, when 29 newborns received the name.
Is Castor a boy or girl name?
Castor is overwhelmingly a boy's name — 100% of babies with the name.
Is the name Castor rising or falling?
Castor has been roughly stable over the past decade.