Kaisei
Boy nameKaisei has been given to 137 babies in the U.S. since 2005. It peaked in 2007. In 2025, about 1 in 284,679 boys was named Kaisei.
Popularity over time births per year, 1880–2025
Total babies
137
Peak year
2007 (10 babies)
Rank in 2025
Below top 1000
First recorded
2005
10-year trend
▼ -14%
Gender split
All boys
Names with a similar vibe
Same primary gender, peaked around the same years, and roughly as common as Kaisei.
Sibling name ideas for Kaisei
Same era and popularity as Kaisei, avoiding matching initials or rhymes.
FAQ
How popular is the name Kaisei?
Kaisei has been given to 137 babies in the U.S. since 2005. It ranked below the top 1000 in 2025.
When did the name Kaisei peak?
Kaisei peaked in 2007, when 10 babies were given the name.
Is Kaisei a girl or boy name?
Kaisei is primarily a boy name (100% of babies named Kaisei are boys).
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