Riordan is a very rare boys' name that peaked in 2013 and has grown less common since.
Riordan is a boy name. In 2025 it ranked #7,103 for boy births in the United States (and #14,928 across all names), given to 12 babies. Riordan first appears in 1986 and peaked in 2013 (18 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 12 | 12 | #7,103 |
| 2023 | 11 | 11 | #7,641 |
| 2022 | 11 | 11 | #7,646 |
| 2021 | 8 | 8 | #9,515 |
| 2020 | 7 | 7 | #10,375 |
| 2019 | 9 | 9 | #8,726 |
| 2018 | 7 | 7 | #10,510 |
| 2017 | 6 | 6 | #11,912 |
| 2016 | 7 | 7 | #10,508 |
| 2015 | 10 | 10 | #7,919 |
| 2014 | 8 | 8 | #9,443 |
| 2013 | 18 | 18 | #5,127 |
| 2012 | 13 | 13 | #6,573 |
| 2011 | 11 | 11 | #7,399 |
| 2010 | 8 | 8 | #9,490 |
| 2009 | 11 | 11 | #7,590 |
| 2008 | 13 | 13 | #6,688 |
| 2007 | 12 | 12 | #6,994 |
| 2006 | 9 | 9 | #8,588 |
| 2004 | 10 | 10 | #7,409 |
| 2003 | 10 | 10 | #7,136 |
| 2002 | 9 | 9 | #7,503 |
| 2001 | 12 | 12 | #5,942 |
| 2000 | 11 | 11 | #6,225 |
| 1999 | 10 | 10 | #6,411 |
| 1998 | 9 | 9 | #6,726 |
| 1997 | 5 | — | #10,482 |
| 1995 | 5 | — | #10,000 |
| 1992 | 8 | — | #6,568 |
| 1989 | 5 | — | #8,958 |
| 1988 | 7 | — | #6,290 |
| 1986 | 5 | — | #7,585 |