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Castor
BoyMeaning of Castor: Greek: 'beaver'
Castor is a boy's name most strongly associated with Greek naming. It has 6 letters and 2 syllables, and it is a genuinely rare and unique choice — 4544th most popular boys' name in the United States in 2025.
US rank 2025
#4544
21 babies in 2025
England & Wales 2024
—
Fewer than 3 babies or unlisted
US babies since 1880
390
First recorded 1998 · peak 2016
Trend
stable
Style: rare
Popularity over time
Gender split
100% boys · 0% girls, based on US, UK and international usage.
Origins & cultures
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Other names starting with C
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Hebrew · 2 syllables
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English · 2 syllables
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Latin · 2 syllables
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Scottish · 3 syllables
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Spanish · 2 syllables
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Irish · 2 syllables
US #170UK #264