Names / Boy names
Castor
Current rank
#4,734
and easing
All-time peak
#3,702
in 2016
First recorded
1998
in U.S. data
Children named
390
since 1998
Popularity over time
Annual U.S. children given the name · Peak #3,702 in 2016 · Source: Social Security Administration
Meaning & background
Castor first shows up in American naming records in 1998, where it reads as a boys' name. These days it lands below the top 1,000, so it still feels distinctive. Only about 390 children have carried it, making it genuinely rare.