Total babies named Isao (all years): 246
| Year | Boys (count / rank / %) |
|---|---|
| 2016 | 5 / #12961 / 0.000% |
| 1944 | 5 / #3650 / 0.000% |
| 1938 | 7 / #3012 / 0.001% |
| 1935 | 5 / #3907 / 0.000% |
| 1934 | 5 / #3918 / 0.000% |
| 1933 | 6 / #3452 / 0.001% |
| 1932 | 6 / #3558 / 0.001% |
| 1930 | 9 / #2879 / 0.001% |
| 1929 | 10 / #2680 / 0.001% |
| 1928 | 9 / #2945 / 0.001% |
| Year | Boys (count / rank / %) |
|---|---|
| 1927 | 9 / #3020 / 0.001% |
| 1926 | 12 / #2488 / 0.001% |
| 1925 | 20 / #1771 / 0.002% |
| 1924 | 13 / #2404 / 0.001% |
| 1923 | 14 / #2275 / 0.001% |
| 1922 | 18 / #1925 / 0.002% |
| 1921 | 15 / #2204 / 0.001% |
| 1920 | 8 / #3348 / 0.001% |
| 1919 | 19 / #1778 / 0.002% |
| 1918 | 10 / #2780 / 0.001% |
| Year | Boys (count / rank / %) |
|---|---|
| 1917 | 18 / #1779 / 0.002% |
| 1916 | 11 / #2460 / 0.001% |
| 1915 | 12 / #2239 / 0.001% |