Kastor
Greek at root, carrying the sense "to shine, to excel". Only about 15 men in Poland go by it, so meeting a Kastor would stick with you for years.
Kastor Pronunciation
Kastor is pronounced KAHS-tor (/ˈkastɔr/).
What Kastor means
Where Kastor comes from and what it has meant to the people who carry it.
Kastor traces back to Greek. Ancient writers tied the name to the verb kékasmai, meaning to excel or to shine, which Polish renders as świetlisty and jaśniejący. The origin is plain.
The best-known Kastor belongs to myth. He was one of the twin Dioscuri, brother of Polydeukes, and a horseman skilled enough that Greeks named him a tamer of horses. The two brothers also guarded sailors, who called on them in storms. After their deaths the pair were set among the stars, and the star Castor still marks a head of the constellation Gemini, the Twins.
Say the name at a Polish roll-call and it stands out, distinct from the Mareks and Piotrs on the register. It has no common Polish diminutive, so it stays whole. What it holds is its Greek root and one bright meaning, jaśniejący.
When Kastor celebrates name day
Kastor appears 3 times in the Polish name day calendar, never as a main name. The first of these dates is 13 February.
Rarer dates. Only the most complete calendars add this name on these days. Most skip them, so hardly anyone celebrates then.
How many people are named Kastor
1 in 1423079 men in Poland is named Kastor. 15 people carry it in the 2025 register: rank #12114 among male names.
Kastor's popularity over time
Fewer than 2 boys were given the name in 2025. It has been stable for a decade.
Kastor as a middle name
Kastor is a first name for 15 men in Poland and a middle name for another 11, a 58/42 split, almost evenly. In the men's middle-name ranking it sits 2952nd, between Karan (11) and Kenji (11).
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#2950 Kane11
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#2951 Karan11
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#2952 Kastor11
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#2953 Kenji11
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#2954 Korwin11