Kazuko
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Meaning
harmonious child
How popular is Kazuko around the world?
In the United States, Kazuko is not on the Social Security record for 2020 to 2025: names under 5 in a year are withheld at source. At the 2022 census, 630 people in Brazil were named Kazuko, ranked 11,400th, with a median age of 78.
Kazuko is on the official records of Brazil and Spain.
United States
under 5 a year
In the United States, Kazuko is not on the Social Security record for 2020 to 2025: names under 5 in a year are withheld at source.
Shape drawn from US Social Security baby-name records. Kazuko has stayed rare in US records the whole time: no peak decade to name.
Births with a Social Security record. Source: U.S. Social Security Administration
Brazil
1 in 330,000
At the 2022 census, 630 people in Brazil were named Kazuko, ranked 11,400th, with a median age of 78.
Among people named Kazuko living in Brazil at the 2022 census, more were born in the 1940s than in any other decade.
people alive at the 2022 census, by decade of birth
People alive and resident in Brazil at the 2022 census, a living-population count, not births; names under 20 are withheld at source. Source: IBGE, Censo Demográfico 2022
Spain
1 in 2.1M
In Spain, 21 residents are named Kazuko, ranked 30,342nd among women, with a mean age of 67.1 years.
Residents of Spain on 1 January 2025. Spain publishes how old a name’s living bearers are, not a birth series, so there is no year chart. Source: INE (Spain), Censo de Población anual, 1 January 2025
Not on the record in Mexico City, Argentina, Puerto Rico, England and Wales, Canada, Ireland, New Zealand, Scotland and Poland: those registries withhold small counts, so rare uses may sit below their floors.
Not on the Chile record: nametree keeps spellings that reached 5 registrations in some year, so rarer uses are not shown. Not on the Montevideo record for 1940 to 2011: that registry withholds nothing, so this spelling was not given there in those years. Not on the France record: nametree keeps spellings that reached 20 births in some year, so rarer uses are not shown. Not on the South Australia record for 1944 to 2017: that registry withholds nothing, so this spelling was not given there in those years. Not on the Austria record for 1984 to 2025: Statistik Austria publishes every first name down to a single birth, so this name was not given there in those years (before 2010 the record covers babies with Austrian citizenship only). Not on Norway’s list: Statistics Norway lists only first names carried by 200 or more living people, so rarer names are not shown.
When you meet Kazuko
Most people given the name Kazuko in the United States were born between 1930 and 1949. The Kazuko you meet today is most often in her 80s or 90s.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
Keep exploring
The Kazuko deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Kazuko truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Kazuko fits with your family’s names and surname.
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