Total babies named Wataru (all years): 142
| Year | Boys (count / rank / %) |
|---|---|
| 2015 | 5 / #13938 / 0.000% |
| 2006 | 6 / #11991 / 0.000% |
| 2003 | 5 / #12686 / 0.000% |
| 2002 | 5 / #12417 / 0.000% |
| 1999 | 6 / #9858 / 0.000% |
| 1998 | 5 / #11256 / 0.000% |
| 1997 | 6 / #9217 / 0.000% |
| 1996 | 7 / #7940 / 0.000% |
| 1994 | 7 / #7738 / 0.000% |
| 1992 | 5 / #9775 / 0.000% |
| Year | Boys (count / rank / %) |
|---|---|
| 1991 | 6 / #8202 / 0.000% |
| 1990 | 8 / #6389 / 0.000% |
| 1989 | 8 / #6208 / 0.000% |
| 1931 | 5 / #4299 / 0.000% |
| 1928 | 9 / #3067 / 0.001% |
| 1925 | 5 / #4840 / 0.000% |
| 1923 | 12 / #2609 / 0.001% |
| 1922 | 5 / #4934 / 0.000% |
| 1921 | 5 / #4952 / 0.000% |
| 1919 | 15 / #2147 / 0.002% |
| Year | Boys (count / rank / %) |
|---|---|
| 1915 | 7 / #3377 / 0.001% |