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Castor meaning and name origin
Castor \c(a)-stor, cas-tor\ as a boy's name is of Greek origin, and the meaning of Castor is "beaver". In classical myth, along with Pollux, one of the heavenly twins immortalized in the constellation Gemini. They were considerd the patron gods of seafarers, appearing to them in Saint Elmo's fire.
Castor has 3 variant forms: Caster, Castorio and Kastor.
For more information, see also the related name Pollux.
Baby names that sound like Castor are Coster and Kester.
View a list of the 2 names that reference Castor.
Popularity of Castor
Castor is not a popular first name for men but a very popular surname or last name for all people (#5833 out of 88799). (1990 U.S. Census)
Displayed below is the baby names popularity of the name Castor for boys. (2010 statistics) Compare Castor with its variant forms and related boy baby names.