Total babies named Kohei (all years): 147
| Year | Boys (count / rank / %) |
|---|---|
| 2017 | 6 / #11556 / 0.000% |
| 2014 | 9 / #8506 / 0.000% |
| 2011 | 6 / #11646 / 0.000% |
| 2008 | 6 / #11914 / 0.000% |
| 2006 | 7 / #10181 / 0.000% |
| 2004 | 6 / #10748 / 0.000% |
| 2003 | 5 / #11938 / 0.000% |
| 2002 | 9 / #7376 / 0.000% |
| 2001 | 6 / #9992 / 0.000% |
| 2000 | 7 / #8719 / 0.000% |
| Year | Boys (count / rank / %) |
|---|---|
| 1998 | 5 / #10554 / 0.000% |
| 1997 | 5 / #10120 / 0.000% |
| 1996 | 6 / #8525 / 0.000% |
| 1994 | 12 / #4980 / 0.001% |
| 1993 | 12 / #4879 / 0.001% |
| 1992 | 11 / #5092 / 0.001% |
| 1991 | 10 / #5315 / 0.000% |
| 1990 | 9 / #5620 / 0.000% |
| 1989 | 10 / #5018 / 0.001% |