Kojiro
A boy's name of Japanese origin with 6 recorded U.S. births.
Meaning & Origin
At 6 letters and three syllables, Kojiro hits the middle ground most parents look for: long enough to feel complete, short enough for everyday use. It has been used as a boy's name in the U.S. since 2010, with 6 total recorded births.
Kojiro is not in the current top 1,000, which means your child is unlikely to share the name with a classmate — a plus for parents who value distinctiveness.
Kojiro is not in the current top 1,000 boy names nationally, making it an uncommon choice — though your state or community may differ.
Kojiro is a boy's baby name of Japanese origin, composed of the elements ko (small, light) and jiro (second son), traditionally meaning 'small second son' or simply used as a classic Japanese masculine given name.
Known in Japanese culture through historical swordsman Sasaki Kojiro, a legendary rival of Miyamoto Musashi, the name carries a sense of quiet intensity and martial heritage.
EtymologyShow more
The ending of a name often carries more etymological information than the beginning. Kojiro's final sounds are open, approachable — ending on a vowel softens the overall impression. In English-language naming, masculine names frequently end on harder consonants or closed syllables, creating a sense of decisiveness and strength. Kojiro softens that pattern, giving it a more versatile feel.
Explore the ending-based name pages on this site to find names that share Kojiro's suffix pattern — names with similar endings often share a style and era, even when they come from different linguistic backgrounds.
At a Glance
Popularity Over Time
Kojiro has 1+ years of history in the U.S., first appearing in 2010.
Popularity by Decade
| Decade | Births | Avg Rank | Trend |
|---|---|---|---|
| 2010s | 6 | #11568 | — |
The Story of Kojiro
A Gen Z name
Peaking in 2010, Kojiro is a name that defines a generation. Boys named Kojiro are most likely born between 2010 and 2010.
How rare is Kojiro?
With fewer than 500 recorded births, Kojiro is an exceptionally rare name — a one-of-a-kind choice.
The journey through the decades
First appeared in the records in 2010, peaked in the 2010s with 6 births that decade.
Year-by-Year Data
View complete yearly data(1 years, 2010–2010)
| Year | Births | Rank |
|---|---|---|
| 2010 | 6 | #11568 |
Source: U.S. Social Security Administration. Showing years with 5+ recorded births.
Frequently Asked Questions
Is Kojiro a boy's or girl's name?
When was Kojiro most popular?
How popular is the name Kojiro?
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Data source: U.S. Social Security Administration, 2010–2010