Kaisen has been given to about 2,637 people in the United States since 1880. It was most common in 2025, which makes it a current name.
Kaisen ranks 800th among American boys in 2025, with 311 born that year. Its best year was 2025, when 311 babies were given the name, ranking 800th. The typical living American called Kaisen is about 6 years old today. It is relatively most common in Mississippi, where it accounts for 0.10% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.