Kosei
boy nameKosei entered the US charts in 2000, peaked at #8324 in 2008, is rarely given today — a rare gem few children share.
Popularity 2000–2025
—
rank today
#8324
peak (2008)
0
babies in 2025
rare
a rare gem few children share
Rank by decade
| Decade | Average rank |
|---|---|
| 2000s | #10663 |
| 2010s | #11657 |
| 2020s | #9554 |
Living bearers
Fewer than a hundred people named Kosei are estimated to be alive in the US today — a true one-of-a-kind name.
The typical Kosei alive today was born around 2010, making them about 15 years old.
Estimated from official SSA birth records and life tables.
Names similar in popularity
Frequently asked questions
- How popular is the name Kosei in 2025?
- Kosei is rarely given in the US today — it does not rank in the top 2000 boy names.
- When was the name Kosei most popular?
- Kosei peaked in 2008, reaching #8324 among US boy names.
- Will my child share the name Kosei with classmates?
- Kosei will almost certainly be the only one in school.
Torn between Kosei and another name?
Put them head to head — full stats, history and a verdict.
Start a name battle