Castor
Meaningbeaver · Greek
- US rank
- #4,707
- Syllables
- 2
- Peak
- #3,681 in 2016
21 babies were named Castor in the US in 2025. It has dropped 789 places in five years.
Found on lists
Save adds it to your list. Vote moves it up the top voted names.
US births per million boys, 1998–2025
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Castor you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- How commonAbout 1 in every 81,301 baby boys born in the US in 2025 was named Castor, 21 babies in all. In a typical school of 500 kids, your Castor would very likely be the only one.
- HistoryCastor first shows up in US birth records in 1998, the first year at least 5 babies got it. It has been in use for 27 years since.
- Best yearIts best year was 2016, when it reached #3,681.
- Then vs nowCastor is 2.4× more common today than it was in 2000. In 2000 it was given to about 1 in 196,078 baby boys; in 2025, about 1 in 81,301.
- TrendCastor has slipped 789 places over the last five years and now sits at #4,707. Good news if you want a familiar name that fewer kids will share.
- MeaningIn Greek, Castor means “beaver”.
About the name Castor
Castor is a boy name of Greek origin meaning “beaver”. It has 6 letters and 2 syllables, starting with C and ending in “-tor”. US birth records list Castor for boys from 1998 to 2025, in 28 of those 28 years. Its best year was 2016, when it ranked #3,681 among boy names. In 2025 it ranked #4,707, with 21 babies.
Origin:Greek names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1990s | 5.0 | 200,000 boys |
| 2000s | 4.5 | 224,215 boys |
| 2010s | 9.4 | 106,270 boys |
| 2020s | 10 | 97,879 boys |
More Greek boy names
- Boy name: Theodore · gift of God
- Boy name: Mateo · gift of God
- Boy name: Lucas · man from Lucania
- Unisex name: Elias · my God is Yahweh
- Boy name: Sebastian · venerable
- Boy name: Leo · lion
- Boy name: Thomas · twin
- Unisex name: Miles · possibly gracious
Questions about the name Castor
What does the name Castor mean?
Castor means “beaver” in Greek.
What is the origin of the name Castor?
Castor has Greek roots in our records. Other Greek names include Theodore, Mateo, Lucas.
Is Castor a boy or girl name?
Castor is a boy name.
How popular is the name Castor?
Castor ranked #4,707 for US boys in 2025, given to 21 babies. Its best year was 2016 (#3,681).