Given name & surname
Koji
Koji is a masculine given name from Japanese. It is used in English and Tagalog.
Original Japaneseこうじ
Meaning & origin
The story
Published U.S. birth records include this spelling as early as 1922. This is the earliest published observation available here, rather than a date for the name’s origin.
From dated birth records
Koji through the years
- Babies since 1880
- 645
- 645 boys · 0 girls
- Most popular year
- 2025
- 34 babies
- 2025
- 34
- #3,412 for boys
- 2021–25 vs 2016–20
- +67%
- Rising fast
Where it’s given
By the numbers
In 2025, this name appeared in 34 U.S. birth records for boys, ranking No. 3,412 among boys’ names. Average annual use for boys was 67.1% higher in 2021–2025 than in 2016–2020. In 2025, California had the largest reported state-level birth count for boys with this name (11). Published U.S. population figures for this spelling include 1,237 as a first name in 2020; 134 as a surname in 2020.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Koji’s family of names
In Filipino usage, Koji was borrowed from the Japanese form こうじ.
Inner ring: spellings · outer: across languages.
Spellings & scripts 3
The same name written differently, including transliterations into other scripts.
Across languages 1
Equivalents and cognates in other languages, plus older forms it grew from.
Similar names
If you love Koji, these share its style, era, origin or sound, from outside its own family.
Takai
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Ohtani
Ohtani is a surname from Japanese. It is used in English and Tagalog.
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Ryuji
“the dragon man”
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Shohei
Shohei is a masculine given name from Japanese. It is used in English, Portuguese, and Tagalog.
>99% boys
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“cooked rice”
>99% boys
Kei
Kei is a unisex given name from Japanese.
92% boys · 8% girls
Rai
“one who is trustworthy” · “a trustworthy man; of lightning and thunder”
78% boys · 22% girls