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Kazuo

#12,984 in 2025Boys' name

Japanese name; meaning depends on kanji

Kazuo has been given to 762 babies in the U.S. since 1911. In 2025 it ranked #12,984 of 13,926 boys’ names in use. Its peak year was 1921, with 57 recorded.

Babies named Kazuo, 2025

1 in 663,000

Kazuo over time, 1880–2025

Boys
020406018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Kazuo: meaning, origin, and history

Japanese name; meaning depends on kanji

Japanese

What Kazuo means

Kazuo is documented with more than one possible Japanese character combination. The Latin-letter spelling records a pronunciation; it does not specify one unique kanji spelling or one universal meaning.

Possible character meanings include one, harmony, peace, male, man, husband, man.

Documented naming usage and pronunciation

Kazuo is used in Japanese.

Another recorded pronunciation is /kä.zɨᵝ.o̞/ for Kazuo.

Origin, language, and formation

Kazuo is used in English. Its origins include Japanese.

American usage and historical context

In the United States, 762 boys were recorded with the name Kazuo between 1911 and 2025. Its highest annual count was 57 in 1921; its best national rank was #933 in 1921.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Kazuo?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 663,000
5 of 3,315,165 births
Among boys only
1 in 342,000
<0.01% of boys
Rank, 2025
#12,984
of 13,926 boys’ names in use
Coin-flip room size
459,581 kids
Even odds of a second one

Where Kazuo sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 459,581 children born in 2025 and it's an even bet that one of them is another Kazuo. In a class of 30 the chance is Under 1%.

When Kazuos were born

Half of everyone ever recorded as Kazuo was born before 1922 — so the typical Kazuo is around 103 today.

Median birth year
1922
About 103 years old
Biggest decade
1920s
49.2% of all use
Born in the last 25 years
3.8%
Mostly a past generation
Recorded since 1950
29
People you could plausibly meet
Choose a decade

1920s — 49.2% of all recorded uses (375).

Is Kazuo rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
8.8%
Peak was 1921 (57)
Years since peak
104
Years
Year-to-year steadiness
Volatile
27.3% average annual change
Best rank ever
#933
1921

Spellings of Kazuo

Kazuo is not the most common spelling — Kairo is, with 51.2% against Kazuo's 3.5%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Kazuo is used

Across 1910–2025, Kazuo was most concentrated in Hawaii — about 1 in 1,887 boys, against 1 in 34,826 across all states with data. It was least common in Washington (1 in 100,000).

153 per 100,000

Most concentrated

  1. 1Hawaii1 in 1,887
  2. 2California1 in 50,000
  3. 3Washington1 in 100,000

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Kazuo has too little recent state data to map, so this covers all years from 1910.

Kazuo by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
#12,984
Trend vs 5 yrs ago
New entry
Best rank ever
#933
1921
Peak year
1921
57 that year
First recorded
1911
Last recorded
2025
All-time count
762
Count in 2025
5

Names similar to Kazuo

Matched on shared beginnings and endings, similar length, and comparable popularity.

KaziKazukiKazimKazKazenKazumaKazmirKazimirKazeKazirKaziahKazdenKazuyaKazeemKazaiKazumiKazierKazutoKazariKazielShizuoKazynKazzKazmer

Sibling names for Kazuo

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Kazuo

Top names of 1921, Kazuo's peak yearThe 1920s in fullOther names that peaked in 1921Boys' names starting with KJapanese Names