Total babies named Riannon (all years): 250
| Year | Girls (count / rank / %) |
|---|---|
| 2006 | 7 / #14796 / 0.000% |
| 2005 | 8 / #12766 / 0.000% |
| 2004 | 5 / #18208 / 0.000% |
| 2003 | 9 / #11141 / 0.000% |
| 2002 | 9 / #10901 / 0.001% |
| 2001 | 11 / #9228 / 0.001% |
| 2000 | 14 / #7494 / 0.001% |
| 1999 | 6 / #14032 / 0.000% |
| 1998 | 9 / #9919 / 0.001% |
| 1997 | 7 / #11792 / 0.000% |
| Year | Girls (count / rank / %) |
|---|---|
| 1996 | 6 / #13087 / 0.000% |
| 1995 | 9 / #9373 / 0.001% |
| 1994 | 10 / #8636 / 0.001% |
| 1993 | 10 / #8547 / 0.001% |
| 1992 | 11 / #7914 / 0.001% |
| 1991 | 9 / #9168 / 0.000% |
| 1990 | 5 / #14685 / 0.000% |
| 1989 | 6 / #11968 / 0.000% |
| 1988 | 13 / #6174 / 0.001% |
| 1987 | 14 / #5541 / 0.001% |
| Year | Girls (count / rank / %) |
|---|---|
| 1986 | 6 / #10550 / 0.000% |
| 1985 | 10 / #6827 / 0.001% |
| 1984 | 9 / #7268 / 0.001% |
| 1982 | 13 / #5457 / 0.001% |
| 1981 | 7 / #8815 / 0.000% |
| 1979 | 8 / #7853 / 0.001% |
| 1978 | 8 / #7464 / 0.001% |
| 1977 | 11 / #5795 / 0.001% |