Kōsei is a boy's name of Japanese origin. Its meaning is not recorded in the standard references we check — we would rather tell you that plainly than guess. It is a rare choice in US records.
Kōsei belongs to the Japanese tradition. Its roots are documented, even though its precise meaning is not recorded in the standard references — an honest gap we prefer to a confident guess.
In the United States, Kōsei first appears in Social Security records in 2000. It climbed to its best-ever rank of #8703 in 2008, and in 2024 0 babies received the name — 90 in total since 1880. Those are the official counts, not estimates.
More names from the Japanese shelf:
The meaning of Kōsei is not recorded in the standard references we check. Rather than repeat an unsourced claim, we leave it open — its Japanese origin is documented, but its exact meaning is not.
Kōsei is a boy name.
Kōsei comes from the Japanese tradition.
Kōsei first appears in US records in 2000. Its best-ever ranking was #8703 in 2008, and 0 babies were given the name in 2024.
Meaning and origin for this page were checked against this source. US popularity figures are from the Social Security Administration's public baby-names data. If you spot an error, write to hello@namepetal.com — accuracy is the whole point of this site, and corrections are made fast.
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