Kaizen
Kaizen was the 364th most popular name for boys in 2025, given to 895 babies. That is its highest rank since records began in 1880. Over the last ten years it has moved up 1,970 places. More babies were named Kaizen in the 2020s than in any other decade.
Meaning improvement (Japanese word) · Japanese
Say it KY-zen /ˈkaɪzən/
- Rank in 2025
- #364 boys, up 1,220 places since 2020
- Babies in 2025
- 895boys
- Girls and boys
- Almost always a boy’s name2021–2025
- Peak year
- 2025895 babies
- Total since 1880
- 3,070babies recorded
What does the name Kaizen mean?
Kaizen is a Japanese word meaning improvement, borrowed into English for the business idea of continuous improvement. Wiktionary and the American Heritage Dictionary give its parts as kai, change, and zen, good, from Chinese characters that also mean "to improve" in Chinese. As a given name it is a modern American choice, appearing in US records only from the 2000s. Wiktionary notes that the business term entered English in 1959.
改善 (Japanese, “improvement (kai 'change' + zen 'good')”)
How sure is this? Well established. The word's meaning is well documented; its use as a first name is recent.
See also: Japanese names.
Sources for this meaning
- The American Heritage Dictionary of the English Language, 5th ed., entry 'kaizen' (etymology), HarperCollins / Houghton Mifflin Harcourt
- Wiktionary, entry 'kaizen' (English section), Wiktionary (CC BY-SA 4.0; facts restated, no text reused)
- US Social Security Administration, national baby-name data 1880-2025 (yob*.txt), team3 computation of first year recorded, US Social Security Administration (public domain)
Kaizen popularity since 1880
A few girls are given the name too: 31 since 2019, 5 in 2025.
| Year | Rank (boys) | Babies (boys) |
|---|---|---|
| 2025 | #364 | 895 |
| 2020 | #1,584 | 103 |
| 2010 | #5,889 | 15 |
| 2000 | — | — |
| 1990 | — | — |
| 1980 | — | — |
| 1970 | — | — |
| 1960 | — | — |
| 1950 | — | — |
| 1940 | — | — |
| 1930 | — | — |
| 1920 | — | — |
| 1910 | — | — |
| 1900 | — | — |
| 1890 | — | — |
| 1880 | — | — |
How popular is Kaizen, counting every spelling?
Kaizen has no other common spelling that sounds the same. Counting every name's spellings together, it ranks #375 for boys in 2025, against #364 on the official list, because Kason/Kasen/Casen and Mohamed/Mohammad/Mohammed and Rhys/Reece/Rhyse move ahead once their spellings are combined.
How many kids will share the name Kaizen?
895 of the 3,606,400 babies born in the US in 2025 were named Kaizen (0.25 per 1,000 births). For a boy named Kaizen born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 9 (of 430 pupils) would have a child named Kaizen.
Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.
How old are people named Kaizen?
About 3,000 people born in the US named Kaizen are alive today, with a median age of 3; half are between 1 and 5. That makes Kaizen a young name: most people with it are children.
Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.
Kaizen by state
How common Kaizen was among boys born in each state in 2021–2025. It is notably more common than nationally in Hawaii (16.2×), Mississippi (3.0×), Louisiana (2.7×), Alabama (2.0×), Arkansas (2.0×). It is least common, relative to the national rate, in Utah, New Jersey, California.
Names with a similar history
These names rose and fell in step with Kaizen: their share of US boys followed the most similar curve since 1880. If you like Kaizen, they share its era and feel.
Middle names for Kaizen · Sibling names for Kaizen
Questions about the name Kaizen
What does Kaizen mean?
Kaizen means “improvement (Japanese word)” (Japanese origin). Certainty: well established.
How popular is the name Kaizen?
Kaizen was the 364th most popular name for boys in 2025, given to 895 babies. That is its highest rank since records began in 1880. Over the last ten years it has moved up 1,970 places. More babies were named Kaizen in the 2020s than in any other decade.
Is Kaizen a boy or girl name?
In 2021–2025, almost always a boy’s name given the name Kaizen in the US.
Where is Kaizen most popular?
In 2021–2025, Kaizen was most common in Hawaii (4.51 per 1,000 boys), followed by Mississippi and Louisiana.