from Wikipedia:
Castor derives from the Greek: Κάστωρ (Kastōr), meaning "beaver", or "he who excels". It originally referred to Castor, one of the Dioscuri/Gemini twins of Graeco-Roman mythology.
Castor or CASTOR may also refer to:
Science and technology
Castor (star), α GeminorumCastor (software), data binding framework for JavaCASTOR (nuclear waste) (cask for storage and transport of radioactive material), containers used to transport highly radioactive nuclear wasteCASTOR experiment, "Centauro and Strange Object Research", measurement tool in the Compact Muon Solenoid experiment at CERNCERN Advanced Storage Manager (CASTOR)
Biology
Castor oil plant, plant from which castor bean grows
Castor oil, oil of the castor beanCastor wax, type of wax produced from castor oilCastor (genus), genus name of the beaver
Castoreum, natural scent derived from the beaverSuperfine sugar, also called caster sugar
Transport
Caster, a type of wheel (spelling variant)
Caster angle, alignment in the vertical longitudinal plane of a motor vehicle's wheels (a misspelling of caster)Castor (rocket stage), built by ThiokolA steam locomotive of the South Devon Railway Eagle classHMS Castor, four ships of the Royal NavyUSS Castor, two ships of the United States NavyCastor, Krebs class (Type 340) minesweeper, of the German Navy
People
First name
Ancient
Castor of Rhodes, Greek grammarian and rhetoricianDrusus Julius Caesar (13 BC-23 CE), Roman consul, son of the Emperor Tiberius, nicknamed "Castor"Saint Castor, the name of several Christian saints
Castor of Apt (died ca. 420), French bishop of AptCastor of Karden (died ca. 400), German priest and hermitSt. Castor & Dorotheus, Armenian early martyrsSeveral other minor figures from classical times, see here
Modern
Castor Cantero (born 1918), Paraguayan football playerCastor McCord (1907–1963), American jazz saxophonist
Surname
Betty Castor (born 1941), American educator and politicianBrian Castor (1889–1979), English cricketerBruce Castor (born 1961), American lawyer and politicianGeorge A. Castor (1855–1906), American politicianJimmy Castor (born 1947), American musicianKathy Castor (born 1966), American politicianStacey Castor (born 1968), American murderer
Fiction
Castor Oyl, fictional character in the Popeye cartoonsCastor Troy, fictional character in the 1997 movie Face/Off, portrayed by Nicolas Cage and John TravoltaCastor, fictional character in the video game Spartan: Total WarriorLord Castor, fictional character in the 2007 movie The HarpyCastor, fictional character in Tron: Legacy, portrayed by Michael Sheen"Castor, Gobernador" fictional character in The Courts of the Morning by John Buchan
Places
Castor, Alberta, CanadaCastor, Cambridgeshire, EnglandCastor, Louisiana, United StatesCastor (mountain), in the Pennine AlpsCastor Bay, Auckland, New ZealandCastor Creek, Louisiana, United StatesCastor River (Missouri)Castor River (Ontario)An old name for Caistor St. Edmund, Norfolk, England
Other uses
Castor (band), American rock bandCastor Cracking Group, Swedish music groupThe Castor Club, an undergraduate secret society at the University of Toronto