How Many People Are Named Koji?
people named Koji are alive in the United States today (estimate)
About 1 in 554,845 people in the US has this name
Based on 645 babies named Koji in Social Security records from 1922 to 2025, and the share of each birth year still alive in 2025.
Popularity Rank
💎💎 Very Rare
Peak Year
34 births
Trend
Stable (last 10 years)
⚧ Gender Distribution
All of the babies given the name Koji in the records were boys.
👥 Age Distribution
The average person named Koji alive today is about 18 years old, and 78% are under 30. Half of them were between 6 and 26 in 2025.
📈 Popularity Over Time
Koji first appears in the records in 1922, and 2025 was its biggest year so far, with 34 babies.
Babies given the name each year, 1922 to 2025
🏆 Rank History
Koji has never been one of the 100 most popular boys' names. Its best rank was #2,655, in 1984. In 2025 it ranked #3,411.
| Boys | |
|---|---|
| Rank in 2025 | #3,411 |
| Best rank | #2,655 (1984) |
| Years in the top 100 | None |
| Rank in its biggest decade | #5,413 in the 2010s |
📍 State-Wise Distribution
People named Koji alive today, by the state where they were born (estimate; state records start in 1910).
More people named Koji were born in California than in any other state: about 135 of those alive today. Compared with the national rate in the same years, Koji was given about 7.2 times as often in California.
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