Kastor
Boy nameKastor has been given to 10 babies in the U.S. since 2017. It peaked in 2017.
Popularity over time births per year, 1880–2025
Total babies
10
Peak year
2017 (5 babies)
Rank in 2025
Below top 1000
First recorded
2017
10-year trend
New / returning
Gender split
All boys
Names with a similar vibe
Same primary gender, peaked around the same years, and roughly as common as Kastor.
Sibling name ideas for Kastor
Same era and popularity as Kastor, avoiding matching initials or rhymes.
FAQ
How popular is the name Kastor?
Kastor has been given to 10 babies in the U.S. since 2017. It ranked below the top 1000 in 2025.
When did the name Kastor peak?
Kastor peaked in 2017, when 5 babies were given the name.
Is Kastor a girl or boy name?
Kastor is primarily a boy name (100% of babies named Kastor are boys).
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