Koji
2 countries#3379 in United States, 2025Popularity across 2 countries
Each line is scaled to its own peak, so you can compare when Koji was in fashion in each country, whatever the population size.
Country by country
🇺🇸 United States
645 births recorded 1922–2025 · currently #3379 · peaked in 2025 with 34 births
Most common in: California, Hawaii, Washington
Source: Social Security Administration, official birth-registration data
🏴🏴 England & Wales
19 births recorded 2009–2021 · currently #3451 · peaked in 2020 with 5 births
Source: Office for National Statistics, official birth-registration data
🇬🇧 United Kingdom
19 births recorded 2009–2021 · peaked in 2020 with 5 births (England & Wales + Scotland + Northern Ireland combined)
Source: ONS, National Records of Scotland & NISRA (combined), official birth-registration data
United States rank history
Koji’s rank among boys’ names, most recent 20 years on record.
| Year | Rank | vs. prior yr |
|---|---|---|
| 2006 | #6904 | — |
| 2007 | #5210 | ↑1694 |
| 2008 | #4540 | ↑670 |
| 2009 | #5800 | ↓1260 |
| 2010 | #4517 | ↑1283 |
| 2011 | #5945 | ↓1428 |
| 2012 | #6001 | ↓56 |
| 2013 | #4981 | ↑1020 |
| 2014 | #5733 | ↓752 |
| 2015 | #5289 | ↑444 |
| 2016 | #3776 | ↑1513 |
| 2017 | #6338 | ↓2562 |
| 2018 | #6036 | ↑302 |
| 2019 | #5813 | ↑223 |
| 2020 | #6620 | ↓807 |
| 2021 | #4936 | ↑1684 |
| 2022 | #4089 | ↑847 |
| 2023 | #3474 | ↑615 |
| 2024 | #4200 | ↓726 |
| 2025 | #3379 | ↑821 |
Frequently asked questions about Koji
Is Koji a popular name?
Yes — Koji currently ranks #3379 among boys’ names in United States as of 2025, based on official birth records.
Is Koji more common for boys or girls?
Koji is recorded predominantly as a boys’ name in official United States birth data.
When was Koji most popular?
Koji peaked in 2025 in United States, with 34 recorded births that year.
Is Koji rising or falling in popularity?
In United States, Koji’s popularity is rising — its rank has improved from #4307 in 1922 to #3379 in 2025.
How many babies have been named Koji?
At least 664 babies have been recorded with the name Koji across official birth statistics in 2 countries.
Is Koji popular in more than one country?
Yes — Koji appears in official birth records in 2 countries: United States, England & Wales.