Where does “Castor” come from?

Castor (English) comes from English cast, from Middle English casten, from Old Norse kasta, from Proto-Germanic kastōną, from Proto-Germanic kas- — to throw; bring up; toss.

Castor (English): One of the Dioscuri

Definitions

  1. One of the Dioscuri

Ancestry of “Castor”, step by step

Castor traces back through two separate lines of ancestry.

via English cast

StepLanguageWordMeaning
1EnglishcastTo throw; To throw forward into the sea; To...
2Middle Englishcastento throw, cast
3Old Norsekastato cast, to throw
4Proto-Germanickastōnąto throw
5Proto-Germanickas-to throw; bring up; toss

via Middle French castor

StepLanguageWordMeaning
1Middle Frenchcastor—
2Old Frenchcastorbeaver
3LatinCastorCastor
4Ancient GreekΚάστωρCastor
5Doric Greekκάστον—

Words derived from “Castor”

Every word from Proto-Germanic kas- →
Castor — Etymology, Origin & Word History | Etymology Explorer