Total babies named Mamoru (all years): 182
| Year | Boys (count / rank / %) |
|---|---|
| 1937 | 5 / #3843 / 0.000% |
| 1935 | 5 / #3966 / 0.000% |
| 1932 | 11 / #2409 / 0.001% |
| 1930 | 6 / #3849 / 0.001% |
| 1929 | 6 / #3807 / 0.001% |
| 1928 | 10 / #2773 / 0.001% |
| 1927 | 11 / #2633 / 0.001% |
| 1926 | 16 / #2040 / 0.001% |
| 1925 | 14 / #2274 / 0.001% |
| 1924 | 16 / #2099 / 0.001% |
| Year | Boys (count / rank / %) |
|---|---|
| 1923 | 10 / #2874 / 0.001% |
| 1922 | 11 / #2739 / 0.001% |
| 1921 | 11 / #2736 / 0.001% |
| 1920 | 11 / #2706 / 0.001% |
| 1919 | 11 / #2607 / 0.001% |
| 1918 | 5 / #4559 / 0.000% |
| 1917 | 9 / #2872 / 0.001% |
| 1916 | 9 / #2852 / 0.001% |
| 1915 | 5 / #4173 / 0.001% |