Total babies named Masao (all years): 1,018
| Year | Boys (count / rank / %) |
|---|---|
| 2019 | 5 / #13420 / 0.000% |
| 2013 | 5 / #13364 / 0.000% |
| 2011 | 8 / #9319 / 0.000% |
| 1982 | 7 / #5398 / 0.000% |
| 1960 | 5 / #4404 / 0.000% |
| 1941 | 6 / #3375 / 0.000% |
| 1940 | 5 / #3774 / 0.000% |
| 1938 | 11 / #2276 / 0.001% |
| 1937 | 10 / #2422 / 0.001% |
| 1936 | 7 / #3061 / 0.001% |
| Year | Boys (count / rank / %) |
|---|---|
| 1935 | 12 / #2203 / 0.001% |
| 1934 | 8 / #2875 / 0.001% |
| 1933 | 13 / #2058 / 0.001% |
| 1932 | 19 / #1693 / 0.002% |
| 1931 | 10 / #2585 / 0.001% |
| 1930 | 24 / #1519 / 0.002% |
| 1929 | 24 / #1508 / 0.002% |
| 1928 | 31 / #1319 / 0.003% |
| 1927 | 33 / #1286 / 0.003% |
| 1926 | 34 / #1258 / 0.003% |
| Year | Boys (count / rank / %) |
|---|---|
| 1925 | 36 / #1196 / 0.003% |
| 1924 | 59 / #913 / 0.005% |
| 1923 | 57 / #910 / 0.005% |
| 1922 | 68 / #825 / 0.006% |
| 1921 | 60 / #906 / 0.005% |
| 1920 | 51 / #969 / 0.005% |
| 1919 | 63 / #827 / 0.006% |
| 1918 | 81 / #705 / 0.008% |
| 1917 | 61 / #816 / 0.007% |
| 1916 | 57 / #830 / 0.006% |
| Year | Boys (count / rank / %) |
|---|---|
| 1915 | 42 / #975 / 0.005% |
| 1914 | 40 / #862 / 0.006% |
| 1913 | 28 / #944 / 0.005% |
| 1912 | 23 / #959 / 0.005% |
| 1911 | 5 / #1912 / 0.002% |
| 1908 | 5 / #1528 / 0.003% |
| 1907 | 5 / #1474 / 0.003% |