Killian is an established boys' name that peaked in 2017 and has grown less common since.
Killian is predominantly a boy name. In 2025 it ranked #418 among boys (770) and #7,333 among girls (15) — overall #819 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 785 | 791 | #7,333 | #418 |
| 2024 | 897 | 906 | #8,716 | #370 |
| 2023 | 896 | 896 | #8,742 | #368 |
| 2022 | 923 | 933 | #6,109 | #364 |
| 2021 | 960 | 966 | #5,857 | #347 |
| 2020 | 912 | 920 | #8,202 | #352 |
| 2019 | 1,105 | 1,114 | #7,195 | #311 |
| 2018 | 1,250 | 1,255 | #5,910 | #287 |
| 2017 | 1,528 | 1,536 | #5,751 | #248 |
| 2016 | 1,401 | 1,412 | #6,554 | #264 |
| 2015 | 1,001 | 1,006 | #5,387 | #350 |
| 2014 | 561 | 561 | #7,494 | #511 |
| 2013 | 310 | 310 | #7,584 | #768 |
| 2012 | 281 | 281 | #10,091 | #819 |
| 2011 | 316 | 316 | #7,283 | #758 |
| 2010 | 309 | 309 | #7,729 | #766 |
| 2009 | 323 | 323 | #6,947 | #752 |
| 2008 | 290 | 290 | #7,939 | #800 |
| 2007 | 269 | 269 | #8,800 | #837 |
| 2006 | 188 | 188 | #9,624 | #1,036 |
| 2005 | 172 | 172 | #10,552 | #1,036 |
| 2004 | 166 | 166 | #7,633 | #1,066 |
| 2003 | 128 | 128 | #9,389 | #1,242 |
| 2002 | 130 | 130 | #8,067 | #1,199 |
| 2001 | 147 | 147 | #6,197 | #1,106 |
| 2000 | 158 | 158 | #5,827 | #1,043 |
| 1999 | 123 | 123 | #9,169 | #1,160 |
| 1998 | 158 | 158 | #5,043 | #1,000 |
| 1997 | 178 | — | #3,498 | #936 |
| 1996 | 161 | — | #5,927 | #911 |
| 1995 | 155 | — | #4,935 | #957 |
| 1994 | 106 | — | #7,363 | #1,186 |
| 1993 | 106 | — | #7,264 | #1,158 |
| 1992 | 93 | — | #4,615 | #1,345 |
| 1991 | 87 | — | #7,183 | #1,302 |
| 1990 | 91 | — | #8,200 | #1,221 |
| 1989 | 67 | — | #6,348 | #1,526 |
| 1988 | 30 | — | #8,795 | #2,654 |
| 1987 | 9 | — | — | #4,769 |
| 1986 | 20 | — | #9,025 | #3,555 |
| 1985 | 9 | — | — | #4,527 |
| 1984 | 7 | — | — | #5,297 |
| 1983 | 9 | — | — | #4,332 |
| 1982 | 9 | — | — | #4,425 |
| 1920 | 5 | — | — | #4,648 |
| 1915 | 5 | — | — | #4,120 |