Dillan is an uncommon variant of Dillon that peaked in 1992 and has since faded.
Dillan is predominantly a boy name. In 2025 it ranked #3,871 among boys (28) and #10,312 among girls (9) — overall #6,876 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 37 | 37 | #10,312 | #3,871 |
| 2024 | 54 | 54 | #9,735 | #2,884 |
| 2023 | 54 | 54 | #8,617 | #2,964 |
| 2022 | 71 | 71 | #9,216 | #2,358 |
| 2021 | 66 | 66 | #8,153 | #2,508 |
| 2020 | 65 | 65 | #8,536 | #2,442 |
| 2019 | 58 | 58 | #11,640 | #2,596 |
| 2018 | 90 | 90 | #7,878 | #1,943 |
| 2017 | 85 | 85 | #6,886 | #2,054 |
| 2016 | 112 | 112 | #11,105 | #1,590 |
| 2015 | 126 | 126 | #12,143 | #1,439 |
| 2014 | 155 | 155 | #8,601 | #1,258 |
| 2013 | 140 | 140 | #9,774 | #1,330 |
| 2012 | 164 | 164 | #7,555 | #1,208 |
| 2011 | 190 | 190 | #6,645 | #1,088 |
| 2010 | 224 | 224 | #5,665 | #985 |
| 2009 | 304 | 304 | #6,377 | #793 |
| 2008 | 270 | 270 | #5,050 | #877 |
| 2007 | 266 | 266 | #9,709 | #839 |
| 2006 | 278 | 278 | #11,700 | #773 |
| 2005 | 297 | 297 | #5,146 | #742 |
| 2004 | 324 | 324 | #6,565 | #667 |
| 2003 | 327 | 327 | #4,337 | #668 |
| 2002 | 263 | 263 | #12,571 | #699 |
| 2001 | 265 | 265 | #16,021 | #693 |
| 2000 | 265 | 265 | — | #673 |
| 1999 | 300 | 300 | — | #609 |
| 1998 | 318 | 318 | #12,897 | #597 |
| 1997 | 293 | — | #12,529 | #612 |
| 1996 | 236 | — | — | #688 |
| 1995 | 275 | — | #14,061 | #626 |
| 1994 | 305 | — | #14,045 | #600 |
| 1993 | 304 | — | #8,930 | #604 |
| 1992 | 341 | — | — | #553 |
| 1991 | 222 | — | — | #681 |
| 1990 | 80 | — | — | #1,227 |
| 1989 | 49 | — | — | #1,622 |
| 1988 | 30 | — | — | #2,100 |
| 1987 | 19 | — | — | #2,751 |
| 1986 | 19 | — | — | #2,708 |
| 1985 | 6 | — | — | #5,988 |
| 1984 | 9 | — | — | #4,293 |
| 1983 | 6 | — | — | #5,666 |
| 1982 | 10 | — | — | #4,020 |
| 1980 | 5 | — | — | #6,505 |
| 1979 | 5 | — | — | #6,303 |
| 1975 | 5 | — | — | #5,684 |