Pious one or beaver
Derived from the Greek 'kastor', the name is most famous for its association with Greek mythology. Castor was the mortal twin of Pollux, together forming the constellation Gemini. While the literal translation refers to the beaver, the name has long been associated with brotherly devotion and celestial navigation.
About 21 boys were named Castor in 2025.
US births per 5-year period, 1990–present (SSA data).
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Filipino Olympic gymnast
