Rhiannan is a very rare variant of Rhiannon that was most common in the 1990s and has all but disappeared.
Rhiannan is a girl name. It last appears in U.S. records in 2009. Rhiannan was first reported in SSA data in 1978 and peaked in 1998 (14 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2009 | 7 | 7 | #14,895 |
| 2008 | 5 | 5 | #19,836 |
| 2006 | 5 | 5 | #19,409 |
| 2005 | 6 | 6 | #16,018 |
| 2004 | 5 | 5 | #18,205 |
| 2003 | 7 | 7 | #13,511 |
| 2002 | 9 | 9 | #10,899 |
| 2001 | 7 | 7 | #13,174 |
| 2000 | 7 | 7 | #12,841 |
| 1999 | 7 | 7 | #12,370 |
| 1998 | 14 | 14 | #7,011 |
| 1997 | 9 | — | #9,642 |
| 1995 | 8 | — | #10,290 |
| 1994 | 6 | — | #13,035 |
| 1992 | 8 | — | #10,243 |
| 1991 | 10 | — | #8,446 |
| 1990 | 8 | — | #9,936 |
| 1989 | 8 | — | #9,449 |
| 1986 | 5 | — | #12,332 |
| 1985 | 6 | — | #10,319 |
| 1984 | 5 | — | #11,711 |
| 1982 | 6 | — | #10,152 |
| 1980 | 6 | — | #10,039 |
| 1978 | 7 | — | #8,324 |