Rhianon is a rare variant of Rhiannon that was most common in the 1970s and has all but disappeared.
Rhianon is a girl name. It last appears in U.S. records in 2008. Rhianon was first reported in SSA data in 1976 and peaked in 1978 (25 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2008 | 7 | 7 | #15,061 |
| 2005 | 5 | 5 | #18,567 |
| 2004 | 12 | 12 | #9,151 |
| 2003 | 5 | 5 | #17,803 |
| 2002 | 6 | 6 | #14,992 |
| 2001 | 8 | 8 | #11,829 |
| 2000 | 13 | 13 | #7,942 |
| 1999 | 8 | 8 | #11,143 |
| 1998 | 14 | 14 | #7,012 |
| 1997 | 5 | — | #15,569 |
| 1996 | 7 | — | #11,511 |
| 1995 | 11 | — | #7,945 |
| 1994 | 12 | — | #7,490 |
| 1993 | 12 | — | #7,363 |
| 1992 | 12 | — | #7,408 |
| 1991 | 11 | — | #7,834 |
| 1990 | 11 | — | #7,738 |
| 1989 | 17 | — | #5,222 |
| 1988 | 12 | — | #6,579 |
| 1987 | 9 | — | #7,841 |
| 1986 | 13 | — | #5,683 |
| 1985 | 15 | — | #5,028 |
| 1984 | 16 | — | #4,674 |
| 1983 | 19 | — | #4,076 |
| 1982 | 15 | — | #4,888 |
| 1981 | 10 | — | #6,691 |
| 1980 | 16 | — | #4,687 |
| 1979 | 9 | — | #7,155 |
| 1978 | 25 | — | #3,172 |
| 1977 | 13 | — | #5,141 |
| 1976 | 7 | — | #7,909 |