Reilly is an established name used for both girls and boys that peaked in 1997 and has since faded.
Reilly is predominantly a girl name. In 2025 it ranked #2,855 among girls (60) and #2,708 among boys (48) — overall #3,373 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 108 | 108 | #2,855 | #2,708 |
| 2024 | 110 | 110 | #2,714 | #2,822 |
| 2023 | 106 | 106 | #3,261 | #2,429 |
| 2022 | 120 | 120 | #2,678 | #2,509 |
| 2021 | 125 | 125 | #2,666 | #2,319 |
| 2020 | 132 | 132 | #2,236 | #2,538 |
| 2019 | 153 | 153 | #2,267 | #2,037 |
| 2018 | 143 | 143 | #2,472 | #2,039 |
| 2017 | 139 | 139 | #2,422 | #2,151 |
| 2016 | 194 | 194 | #2,013 | #1,671 |
| 2015 | 174 | 174 | #2,137 | #1,800 |
| 2014 | 193 | 193 | #2,152 | #1,546 |
| 2013 | 217 | 217 | #1,936 | #1,457 |
| 2012 | 257 | 257 | #1,870 | #1,205 |
| 2011 | 283 | 283 | #1,569 | #1,226 |
| 2010 | 302 | 302 | #1,581 | #1,142 |
| 2009 | 335 | 335 | #1,438 | #1,084 |
| 2008 | 403 | 403 | #1,293 | #958 |
| 2007 | 417 | 417 | #1,246 | #911 |
| 2006 | 352 | 352 | #1,321 | #1,046 |
| 2005 | 419 | 419 | #1,014 | #978 |
| 2004 | 436 | 436 | #907 | #990 |
| 2003 | 472 | 472 | #876 | #875 |
| 2002 | 509 | 509 | #776 | #823 |
| 2001 | 527 | 527 | #738 | #817 |
| 2000 | 483 | 483 | #795 | #827 |
| 1999 | 498 | 498 | #699 | #872 |
| 1998 | 538 | 538 | #623 | #908 |
| 1997 | 543 | — | #623 | #806 |
| 1996 | 316 | — | #1,075 | #921 |
| 1995 | 179 | — | #1,744 | #1,189 |
| 1994 | 144 | — | #1,837 | #1,467 |
| 1993 | 139 | — | #2,030 | #1,393 |
| 1992 | 93 | — | #3,021 | #1,633 |
| 1991 | 83 | — | #3,027 | #1,790 |
| 1990 | 95 | — | #2,392 | #1,834 |
| 1989 | 46 | — | #4,477 | #2,596 |
| 1988 | 46 | — | #5,821 | #2,024 |
| 1987 | 36 | — | #4,825 | #2,809 |
| 1986 | 51 | — | #4,903 | #1,784 |
| 1985 | 46 | — | #9,037 | #1,640 |
| 1984 | 21 | — | #11,702 | #2,921 |
| 1983 | 20 | — | #8,741 | #3,378 |
| 1982 | 19 | — | #8,027 | #3,900 |
| 1981 | 16 | — | #11,687 | #3,802 |
| 1980 | 13 | — | #7,949 | #7,058 |
| 1979 | 8 | — | — | #4,753 |
| 1978 | 6 | — | #9,423 | — |
| 1975 | 5 | — | — | #6,128 |
| 1974 | 5 | — | — | #5,830 |
| 1958 | 7 | — | — | #3,504 |
| 1953 | 6 | — | — | #3,710 |