Castor is a distinctive boys' name in United States, ranking #6887 in 2024 with 12 recorded births. This places Castor in the top 48% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2016 with 29 births ranking #3702. In 2024, approximately 1 in every 142,943 boys born was named Castor. RISING Recent data shows the name is currently rising.