Gillian is an established girls' name that peaked in 1999 and has since faded.
Gillian is predominantly a girl name. In 2025 it ranked #3,307 for girl births in the United States (and #5,855 across all names), given to 47 babies. Gillian was first reported in SSA data in 1922 and peaked in 1999 (1,022 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 47 | 47 | #3,307 | — |
| 2024 | 52 | 52 | #3,093 | — |
| 2023 | 51 | 51 | #3,199 | — |
| 2022 | 52 | 52 | #3,135 | — |
| 2021 | 51 | 51 | #3,174 | — |
| 2020 | 52 | 52 | #3,069 | — |
| 2019 | 59 | 59 | #2,834 | — |
| 2018 | 88 | 88 | #2,151 | — |
| 2017 | 81 | 81 | #2,289 | — |
| 2016 | 111 | 111 | #1,915 | #11,191 |
| 2015 | 120 | 120 | #1,746 | — |
| 2014 | 125 | 125 | #1,686 | — |
| 2013 | 120 | 120 | #1,730 | — |
| 2012 | 166 | 166 | #1,392 | — |
| 2011 | 188 | 188 | #1,267 | — |
| 2010 | 216 | 216 | #1,154 | #12,916 |
| 2009 | 251 | 251 | #1,038 | — |
| 2008 | 339 | 339 | #835 | — |
| 2007 | 366 | 366 | #790 | — |
| 2006 | 370 | 370 | #759 | #8,997 |
| 2005 | 420 | 420 | #661 | — |
| 2004 | 513 | 513 | #556 | — |
| 2003 | 638 | 638 | #467 | — |
| 2002 | 761 | 761 | #388 | — |
| 2001 | 863 | 863 | #348 | — |
| 2000 | 982 | 982 | #325 | #9,506 |
| 1999 | 1,030 | 1,030 | #303 | #7,393 |
| 1998 | 890 | 890 | #331 | — |
| 1997 | 659 | — | #396 | — |
| 1996 | 379 | — | #604 | — |
| 1995 | 221 | — | #871 | — |
| 1994 | 162 | — | #1,105 | — |
| 1993 | 176 | — | #1,046 | — |
| 1992 | 197 | — | #971 | — |
| 1991 | 213 | — | #925 | #8,663 |
| 1990 | 245 | — | #822 | #6,681 |
| 1989 | 263 | — | #748 | — |
| 1988 | 291 | — | #684 | #4,551 |
| 1987 | 265 | — | #694 | — |
| 1986 | 209 | — | #804 | — |
| 1985 | 234 | — | #738 | — |
| 1984 | 255 | — | #671 | — |
| 1983 | 227 | — | #728 | — |
| 1982 | 260 | — | #688 | #6,704 |
| 1981 | 222 | — | #745 | — |
| 1980 | 173 | — | #886 | — |
| 1979 | 174 | — | #878 | — |
| 1978 | 183 | — | #847 | #4,296 |
| 1977 | 162 | — | #885 | — |
| 1976 | 95 | — | #1,195 | — |
| 1975 | 100 | — | #1,155 | — |
| 1974 | 110 | — | #1,074 | — |
| 1973 | 139 | — | #899 | — |
| 1972 | 128 | — | #950 | — |
| 1971 | 121 | — | #1,021 | — |
| 1970 | 125 | — | #998 | — |
| 1969 | 127 | — | #946 | — |
| 1968 | 116 | — | #959 | — |
| 1967 | 84 | — | #1,159 | — |
| 1966 | 83 | — | #1,175 | — |
| 1965 | 82 | — | #1,190 | — |
| 1964 | 70 | — | #1,346 | — |
| 1963 | 61 | — | #1,430 | — |
| 1962 | 65 | — | #1,377 | — |
| 1961 | 51 | — | #1,583 | — |
| 1960 | 19 | — | #2,846 | — |
| 1959 | 35 | — | #1,897 | — |
| 1958 | 25 | — | #2,281 | — |
| 1957 | 31 | — | #1,965 | — |
| 1956 | 26 | — | #2,168 | — |
| 1955 | 29 | — | #1,994 | — |
| 1954 | 16 | — | #2,812 | — |
| 1953 | 19 | — | #2,457 | — |
| 1952 | 16 | — | #2,717 | — |
| 1951 | 19 | — | #2,339 | — |
| 1950 | 18 | — | #2,377 | — |
| 1949 | 23 | — | #2,031 | — |
| 1948 | 19 | — | #2,280 | — |
| 1947 | 22 | — | #2,104 | — |
| 1946 | 11 | — | #3,102 | — |
| 1945 | 13 | — | #2,515 | — |
| 1944 | 7 | — | #3,834 | — |
| 1943 | 10 | — | #3,120 | — |
| 1942 | 7 | — | #3,879 | — |
| 1941 | 9 | — | #3,098 | — |
| 1940 | 7 | — | #3,634 | — |
| 1938 | 6 | — | #4,021 | — |
| 1937 | 6 | — | #3,982 | — |
| 1922 | 5 | — | #5,306 | — |