The baby name Rhiannon appears in baby name data for the United States from 1976 to 2024. It was most popular in 1999 with 668 babies given the name.
In the later years of this period, Rhiannon has become less common than it once was.
| Year | Count |
|---|---|
| 1976 | 233 |
| 1977 | 493 |
| 1978 | 517 |
| 1979 | 451 |
| 1980 | 379 |
| 1981 | 370 |
| 1982 | 332 |
| 1983 | 320 |
| 1984 | 356 |
| 1985 | 253 |
| 1986 | 266 |
| 1987 | 235 |
| 1988 | 199 |
| 1989 | 267 |
| 1990 | 287 |
| 1991 | 296 |
| 1992 | 307 |
| 1993 | 299 |
| 1994 | 360 |
| 1995 | 306 |
| 1996 | 242 |
| 1997 | 316 |
| 1998 | 614 |
| 1999 | 668 |
| 2000 | 611 |
| 2001 | 553 |
| 2002 | 462 |
| 2003 | 489 |
| 2004 | 505 |
| 2005 | 387 |
| 2006 | 445 |
| 2007 | 281 |
| 2008 | 214 |
| 2009 | 161 |
| 2010 | 135 |
| 2011 | 96 |
| 2012 | 70 |
| 2013 | 20 |
| 2014 | 76 |
| 2015 | 54 |
| 2016 | 83 |
| 2017 | 90 |
| 2018 | 78 |
| 2019 | 135 |
| 2020 | 143 |
| 2021 | 217 |
| 2022 | 190 |
| 2023 | 162 |
| 2024 | 105 |