Total babies named Tatsuo (all years): 222
| Year | Boys (count / rank / %) |
|---|---|
| 1940 | 6 / #3425 / 0.001% |
| 1930 | 7 / #3560 / 0.001% |
| 1929 | 7 / #3523 / 0.001% |
| 1928 | 39 / #1144 / 0.004% |
| 1927 | 8 / #3419 / 0.001% |
| 1926 | 9 / #3117 / 0.001% |
| 1925 | 8 / #3371 / 0.001% |
| 1924 | 6 / #4295 / 0.001% |
| 1923 | 9 / #3150 / 0.001% |
| 1922 | 7 / #3831 / 0.001% |
| Year | Boys (count / rank / %) |
|---|---|
| 1921 | 12 / #2612 / 0.001% |
| 1920 | 7 / #3778 / 0.001% |
| 1919 | 8 / #3362 / 0.001% |
| 1918 | 16 / #2064 / 0.002% |
| 1917 | 10 / #2708 / 0.001% |
| 1916 | 57 / #833 / 0.006% |
| 1915 | 6 / #3786 / 0.001% |