Riannon is a very rare girls' name that was most common in the 1980s and has all but disappeared.
Riannon is a girl name. It last appears in U.S. records in 2006. Riannon was first reported in SSA data in 1977 and peaked in 1987 (14 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2006 | 7 | 7 | #14,796 |
| 2005 | 8 | 8 | #12,767 |
| 2004 | 5 | 5 | #18,209 |
| 2003 | 9 | 9 | #11,141 |
| 2002 | 9 | 9 | #10,901 |
| 2001 | 11 | 11 | #9,229 |
| 2000 | 14 | 14 | #7,495 |
| 1999 | 6 | 6 | #14,032 |
| 1998 | 9 | 9 | #9,919 |
| 1997 | 7 | — | #11,792 |
| 1996 | 6 | — | #13,087 |
| 1995 | 9 | — | #9,373 |
| 1994 | 10 | — | #8,635 |
| 1993 | 10 | — | #8,546 |
| 1992 | 11 | — | #7,913 |
| 1991 | 9 | — | #9,168 |
| 1990 | 5 | — | #14,685 |
| 1989 | 6 | — | #11,970 |
| 1988 | 13 | — | #6,174 |
| 1987 | 14 | — | #5,542 |
| 1986 | 6 | — | #10,551 |
| 1985 | 10 | — | #6,828 |
| 1984 | 9 | — | #7,269 |
| 1982 | 13 | — | #5,457 |
| 1981 | 7 | — | #8,815 |
| 1979 | 8 | — | #7,854 |
| 1978 | 8 | — | #7,464 |
| 1977 | 11 | — | #5,795 |