599births recorded
5Countries
1Variants
2021Peak · Belgium
#4707United States 2025
Castor is a boy name family recorded 599 times in 5 countries since 1935. It ranks highest today in the United States (#4707 in 2025). Its all-time peak was in Belgium in 2021, at 13.8 births per 100,000.
Popularity by country
Births per 100,000 newborns, all forms of the name combined.
All forms of Castor
| Variants | Language | Total births | Country | Latest rank | Peak year | 10-year trend |
|---|---|---|---|---|---|---|
| Castor | Spanish | 390 | 🇺🇸 United States | #4707 | 2016 | ▲ 37 % |
| Castor | Spanish | 125 | 🇦🇷 Argentina | – | 1937 | – |
| Castor | Spanish | 59 | 🇧🇪 Belgium | – | 2021 | – |
| Castor | Spanish | 20 | 🇸🇪 Sweden | – | 2013 | – |
| Castor | Spanish | 5 | 🏴 England & Wales | – | 2022 | – |
Questions about Castor
How popular is the name Castor?
In 2025 it ranked #4707 in the United States. Official registers record 599 births across 5 countries.
When was Castor most popular?
It peaked in Belgium in 2021, at 13.8 births per 100,000.
Is Castor a boy or a girl name?
In official birth registers, Castor is a boy name.