Masao
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Meaning
a right and proper man, or hero, depending on the kanji
How popular is Masao around the world?
In the United States, Masao 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, 189 people in Brazil were named Masao, ranked 26,468th, with a median age of 72.
Masao is on the official records of Brazil.
United States
under 5 a year
In the United States, Masao 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. Masao 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 1M
At the 2022 census, 189 people in Brazil were named Masao, ranked 26,468th, with a median age of 72.
Among people named Masao 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
Montevideo City
last on record 1986
Masao is not on the 2011 record for Montevideo, whose registry withholds nothing, so the spelling was not given there that year.
The count never rose above 1 in a year, too few to chart.
Births in the department of Montevideo (not all of Uruguay) by first name and year of birth, 1940–2011, from the city’s civil registry, which writes names in capitals, almost always without accents; counted as spelling groups (accent and punctuation variants merged), nothing is withheld at source, and 2012 is excluded as a partial year. Source: Servicio de Registro Civil, Intendencia de Montevideo, Partidas de Registro Civil de Montevideo (Licencia de Datos Abiertos - Uruguay); 2012 dropped as partial
Not on the record in Spain, 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 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 Masao
People given the name Masao in the United States span the generations: the middle half were born anywhere from 1930 to 2019. Age is the one thing the name won't tell you.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
Keep exploring
The Masao deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Masao 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 Masao fits with your family’s names and surname.
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