Castor: a male name of Greek origin meaning "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean".It derives from the Greek word "(kékasmai) (katharós) > Kástōr".
In Greek tradition, Castor holds special significance as a masculine name representing This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean. This name has been cherished across generations, carrying with it the wisdom and heritage of Greek culture. Its enduring popularity speaks to its universal resonance.
Quick Facts About Castor
Quick facts about Castor
Origin
Greek
Gender
Boy name
Popularity
Moderately popular
Researched by Name Doctor Linguistics Team
Our names are verified by professional linguists with expertise in etymology and cultural naming traditions.
Last reviewed: November 2025
Meaning
This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”
Etymology & Details
Name Root
(kékasmai) (katharós) > Kástōr
How to Pronounce Castor
Castor is pronounced /ˈkæstər/(Greek)
Step-by-step pronunciation guide:
Break it into syllables: Cas-tor
Say it like: "KASTOOHR"
Practice saying it naturally a few times
✓Pronunciation verified by linguistic sources
Usage & Popularity
This name has found popularity across english, galician, and ancient Greek (Latinized) speaking regions, demonstrating its cross-cultural appeal and adaptability.
englishgalicianancient Greek (Latinized)
Frequently Asked Questions About Castor
What does the name Castor mean?
Castor means "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”". The name comes from (kékasmai) (katharós) > Kástōr. In its original form, the name derives from kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ). This greek name has been passed down through generations, carrying its meaning across different cultures and time periods. Parents who choose Castor for boys often connect with the name's meaning of "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”" as a quality they hope to see in their child. While not the most common choice, Castor's meaningful roots have given it staying power among parents looking for a name with substance. The name is associated with qualities like GREEK MYTHOLOGY (HEROES), reflecting its meaning in how people perceive those who carry it.
What is the origin of the name Castor?
Castor is a greek name. The name traces back to (kékasmai) (katharós) > Kástōr. The original form kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ) shows the name's roots in its native language. From its greek roots, Castor spread to become common in english, galician, ancient Greek (Latinized). The greek meaning "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”" reflects values important in the culture where this name first appeared.
Is Castor a boy or girl name?
Castor is a boy's name. The name has been used for boys across many generations, maintaining its masculine character through different eras and cultures. In greek tradition, Castor has historically been given to boys. The meaning "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”" carries well for a son, giving the name lasting appeal.
How do you pronounce Castor?
Castor is pronounced "/ˈkæstər/". This pronunciation follows el language patterns. As a single-syllable name, Castor is quick to say and easy to call out. Pronunciation may vary slightly in english, galician, ancient Greek (Latinized), where the name is also used. Local accents and language rules can shift certain sounds while keeping the name recognizable. If you're unfamiliar with greek names, listening to a native speaker say Castor can help you catch the right rhythm and emphasis. The name's root (kékasmai) (katharós) > Kástōr influences how Castor sounds in its original language.
How popular is the name Castor?
Castor is somewhat common, familiar to most people. With moderate popularity, Castor offers familiarity without being everywhere. It's the kind of name people recognize but don't hear every day. Castor's popularity may vary between greek communities and the broader population, where naming trends differ. The name's meaning of "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”" likely influences its appeal, as parents often choose names that express values or hopes for their children. Among boys' names, Castor holds its own, appealing to parents who value distinctive options.
Where is the name Castor commonly used?
Castor is common in english and galician and ancient Greek (Latinized) naming traditions. Though greek in origin, Castor found a home in other cultures where it resonated with local naming preferences. Names that work across multiple cultures, like Castor, often have straightforward pronunciation and positive meanings that translate well. The meaning "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”" carries universal appeal, helping explain why different cultures adopted Castor into their naming traditions. A child named Castor will likely find their name recognized in multiple countries, which can be an advantage for families with international connections or who value global accessibility. Across these cultures, Castor is given to boys, maintaining consistent gender association.
What is the cultural significance of Castor?
Castor carries associations with GREEK MYTHOLOGY (HEROES). These qualities shape how people perceive the name and those who carry it, creating expectations and first impressions. The name's meaning of "This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”" reinforces these associations, connecting the literal translation to the character traits people expect. In greek culture, where Castor originates, these qualities held particular value, making the name a way to express hopes for a child's character. Research shows that names do influence perceptions. People form impressions based on names before meeting someone, which means choosing Castor sets certain expectations. Parents choosing Castor often connect with one or more of these associations, selecting the name because it represents qualities they value or wish for their child. In english communities, these associations may carry extra weight, as naming traditions often reinforce cultural values.
Sources: Etymology verified through linguistic research including Oxford Dictionary of First Names, Behind the Name, and academic etymology databases.