Total babies named Masayo (all years): 67
| Year | Girls (count / rank / %) |
|---|---|
| 1928 | 5 / #5189 / 0.000% |
| 1922 | 8 / #3889 / 0.001% |
| 1920 | 7 / #4261 / 0.001% |
| 1919 | 9 / #3372 / 0.001% |
| 1918 | 7 / #4134 / 0.001% |
| 1917 | 8 / #3588 / 0.001% |
| 1916 | 7 / #3795 / 0.001% |
| 1915 | 10 / #2831 / 0.001% |
| 1914 | 6 / #3471 / 0.001% |