Kaisei vs Kai

Side-by-side comparison of Kaisei and Kai — popularity rank, total births, peak decade, and historical trends from Social Security Administration data.

Name A

Kaisei

Boy name · Rank #8719

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Name B

Kai

Boy name · Rank #76

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Which name is more popular?

Metric Kaisei Kai
Current Rank #8719 #76
Total Births (all years) 131 66,409
Peak Year 2007 2022
Peak Year Births 10 5,366
Peak Decade 2010ss 2010ss
Gender Boy Boy
First Recorded Year 2005 1926

Births by Decade

Decade Kaisei Kai
1920ss — 6
1930ss — 6
1940ss — 10
1950ss — 148
1960ss — 341
1970ss — 593
1980ss — 960
1990ss — 2,639
2000ss 33 12,620
2010ss 70 25,976
2020ss 28 23,110

Recent Annual Births (2014–present)

Year Kaisei Kai
2014 9 2,411
2015 7 2,852
2016 6 2,895
2017 9 3,155
2018 5 3,462
2019 9 3,741
2020 — 3,863
2021 6 4,638
2022 7 5,366
2023 6 4,967
2024 9 4,276

Data Sources

Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications — National Data, ssa.gov/oact/babynames.
Source: SSA Annual Name Rankings, 2005–2024.

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