Masao
1,018 US births on record
Masao in the United States
Between 1936 and 2019 the name has been falling — down 59% as a share of boys' births.
SOURCE·US Social Security Administration, national baby-name data·Public domain. SSA lists a name only if it was given to at least 5 babies of that sex that year.·REVIEWED JUL 2026
Masao in New Zealand
Masao never reached 10 births in a single year in New Zealand, so it does not appear in the DIA file. That is a reporting floor, not a zero — the name may still have been registered here, just never ten times in one year.
SOURCE·NZ Department of Internal Affairs, births by first name·CC BY 4.0. DIA lists a name only if it was given to at least 10 babies of that sex that year.·REVIEWED JUL 2026
Decade by decade in the US
| Year | Rank | Births |
|---|---|---|
| 1910 | below floor | — |
| 1920 | #965 | 51 |
| 1930 | #1,496 | 24 |
| 1940 | #3,459 | 5 |
| 1950 | below floor | — |
| 1960 | #4,038 | 5 |
| 1970 | below floor | — |
| 1980 | below floor | — |
| 1990 | below floor | — |
| 2000 | below floor | — |
| 2010 | below floor | — |
| 2020 | below floor | — |
Where in the United States
The states that registered Masao most often since 1907. These are lifetime totals, so they track state population as much as local taste — a name common in Wyoming will never out-count California.
| State | Births |
|---|---|
| Hawaii | 519 |
| California | 323 |
| Washington | 29 |
| Oregon | 5 |
How these figures are worked out
- Counts come straight from the registrars: the US Social Security Administration (1880–2025) and the New Zealand Department of Internal Affairs (1900–2025). Nothing is scraped from another names site.
- Ranks are computed against every name in that year's file, not just the ones this site publishes pages for — otherwise a rank would flatter every name we happen to list.
- The curve is drawn on births per 100,000 of that sex, not raw counts. Raw counts across eras are misleading: far more births were registered in 1957 than in 1890, so a flat count is a falling share.
- Each country hides small numbers — the US below 5 births a year, New Zealand below 10. A gap in a line is "below the floor", never "nobody".
SOURCE·US SSA (1880–2025) + NZ DIA (1900–2025) birth registrations·ranks and shares computed from the source files, see method·REVIEWED JUL 2026