Kazuko

Girls' name

Japanese name; meaning depends on kanji

Kazuko has been given to 398 babies in the U.S. since 1915. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 1927, with 63 recorded.

Babies named Kazuko, 1945

1 in 531,000

Kazuko over time, 1880–2025

Girls

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Kazuko: meaning, origin, and history

Japanese name; meaning depends on kanji

Japanese

What Kazuko means

Kazuko 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, child.

Documented naming usage and pronunciation

Kazuko is used in Japanese.

Another recorded pronunciation is /kä.zɨᵝ.ko̞/ for Kazuko.

Origin, language, and formation

Kazuko is used in English, French and Portuguese. Its origins include Japanese.

Kazuko comes through Japanese かずこ.

Pronunciation and spelling

In French, Kazuko is pronounced /ka.zu.ko/.

American usage and historical context

In the United States, 398 girls were recorded with the name Kazuko between 1915 and 1945. Its highest annual count was 63 in 1927; its best national rank was #958 in 1927.

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 Kazuko?

Kazuko had fewer than 5 recorded uses in 2025, so these figures use 1945, the last year it was published.

Among all babies, 1945: 1 in 531,000; 5 of 2,652,840 births
Among girls only: 1 in 261,000; <0.01% of girls
Rank, 1945: Unranked; Fewer than 5 uses
Coin-flip room size: 367,763 kids; Even odds of a second one

Where Kazuko sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 1945 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 367,763 children born in 1945 and it's an even bet that one of them is another Kazuko. In a class of 30 the chance is Under 1%.

When Kazukos were born

Half of everyone ever recorded as Kazuko was born before 1927 — so the typical Kazuko is around 98 today.

Median birth year: 1927; About 98 years old
Biggest decade: 1920s; 53.8% of all use
Born in the last 25 years: 82.7%; A modern name
Recorded since 1950: 0; People you could plausibly meet

Choose a decade

1920s — 53.8% of all recorded uses (214).

Is Kazuko 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: 0%; Peak was 1927 (63)
Years since peak: 98; Years
Year-to-year steadiness: Volatile; 47.7% average annual change
Best rank ever: #958; 1927

Spellings of Kazuko

Kazuko is not the most common spelling — Haruko is, with 63.1% against Kazuko's 36.9%.

Haruko63.1%680
Kazuko36.9%398

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 Kazuko is used

Across 1910–2025, Kazuko was most concentrated in Hawaii — about 1 in 6,667 girls, against 1 in 65,805 across all states with data. It was least common in Washington (1 in 100,000).

115 per 100,000

State popularity map

Most concentrated

1Hawaii1 in 6,667
2California1 in 100,000
3Washington1 in 100,000

Shading is the share of that state's recorded girls 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. Kazuko has too little recent state data to map, so this covers all years from 1910.

Kazuko by the numbers

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

As a girl's name

Rank in 2025: Unranked
Trend vs 5 yrs ago: —
Best rank ever: #958; 1927
Peak year: 1927; 63 that year
First recorded: 1915
Last recorded: 1945
All-time count: 398
Count in 2025: Under 5

Names similar to Kazuko

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

Kaziah Kazia Kaziyah Kaziya Kazlyn Kazaria Kazlynn Nezuko Kazi Teruko Nobuko Kazue Yasuko Kazari Haruko Kazandra Kazoua Kazleigh Setsuko Mitsuko Shizuko Kazumi Hatsuko Kazelyn

Sibling names for Kazuko

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

For a sister

Darline Leatrice Pearline Ima Belva Edward George Paul

For a brother

Frances Jewel Napoleon Raymon Merlin Domenick Jules Bud

Explore around Kazuko

Top names of 1927, Kazuko's peak year The 1920s in full Other names that peaked in 1927 Girls' names starting with K