Rheannon is a rare variant of Rhiannon that was most common in the 1970s and has all but disappeared.
Rheannon is a girl name. It last appears in U.S. records in 2008. Rheannon was first reported in SSA data in 1976 and peaked in 1977 (21 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2008 | 6 | 6 | #17,042 |
| 2007 | 7 | 7 | #15,144 |
| 2006 | 9 | 9 | #12,210 |
| 2005 | 12 | 12 | #9,330 |
| 2004 | 7 | 7 | #13,874 |
| 2003 | 10 | 10 | #10,268 |
| 2002 | 14 | 14 | #7,739 |
| 2001 | 20 | 20 | #5,764 |
| 2000 | 20 | 20 | #5,647 |
| 1999 | 20 | 20 | #5,384 |
| 1998 | 13 | 13 | #7,434 |
| 1997 | 12 | — | #7,628 |
| 1996 | 11 | — | #7,991 |
| 1995 | 8 | — | #10,289 |
| 1994 | 14 | — | #6,578 |
| 1993 | 15 | — | #6,178 |
| 1992 | 10 | — | #8,574 |
| 1991 | 13 | — | #6,890 |
| 1990 | 11 | — | #7,737 |
| 1989 | 15 | — | #5,776 |
| 1988 | 14 | — | #5,823 |
| 1987 | 15 | — | #5,257 |
| 1986 | 8 | — | #8,304 |
| 1985 | 14 | — | #5,282 |
| 1984 | 16 | — | #4,672 |
| 1983 | 13 | — | #5,378 |
| 1982 | 19 | — | #4,138 |
| 1981 | 17 | — | #4,484 |
| 1980 | 20 | — | #3,963 |
| 1979 | 15 | — | #4,794 |
| 1978 | 16 | — | #4,408 |
| 1977 | 21 | — | #3,578 |
| 1976 | 5 | — | #10,472 |