Kastor

Kastor is a masculine name with ancient Greek origins, being a variant spelling of Castor. In Greek mythology, Castor was one of the twin Dioscuri, the son of Zeus and Leda and brother to Pollux. The name is also associated with the brightest star in the Gemini constellation. Historically, the name may relate to the Greek word 'kekasmai' meaning 'to excel' or 'to shine.' While uncommon in modern usage, Kastor offers strong mythological connections and a powerful sound. The alternative spelling with 'K' gives the name a distinctive, slightly Nordic or Eastern European feel while maintaining its classical roots. Parents drawn to mythology and celestial names may find Kastor particularly appealing.

Pronounced KAS-tor.

As of October 2026, Kastor ranked #13110 in US births in 2021 SSA.