Total babies named Masaaki (all years): 60
| Year | Boys (count / rank / %) |
|---|---|
| 1934 | 7 / #3183 / 0.001% |
| 1929 | 6 / #3817 / 0.001% |
| 1926 | 6 / #4032 / 0.001% |
| 1923 | 5 / #4648 / 0.000% |
| 1922 | 6 / #4144 / 0.001% |
| 1921 | 5 / #4746 / 0.000% |
| 1920 | 5 / #4717 / 0.000% |
| 1919 | 5 / #4566 / 0.001% |
| 1918 | 5 / #4576 / 0.000% |
| 1913 | 5 / #3103 / 0.001% |
| Year | Boys (count / rank / %) |
|---|---|
| 1912 | 5 / #2777 / 0.001% |