Castor
Boy nameCastor has been given to 390 babies in the U.S. since 1998. It peaked in 2016. In 2025, about 1 in 81,337 boys was named Castor.
Popularity over time births per year, 1880–2025
Total babies
390
Peak year
2016 (29 babies)
Rank in 2025
Below top 1000
First recorded
1998
10-year trend
▲ +24%
Gender split
All boys
Names with a similar vibe
Same primary gender, peaked around the same years, and roughly as common as Castor.
Sibling name ideas for Castor
Same era and popularity as Castor, avoiding matching initials or rhymes.
FAQ
How popular is the name Castor?
Castor has been given to 390 babies in the U.S. since 1998. It ranked below the top 1000 in 2025.
When did the name Castor peak?
Castor peaked in 2016, when 29 babies were given the name.
Is Castor a girl or boy name?
Castor is primarily a boy name (100% of babies named Castor are boys).
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