Is Brennan a boy or girl name?
Brennan is mostly a boy name in the US. In 2024, 18 girls and 207 boys were named Brennan, so 8% were girls. Across 1880–2024, 6.3% of the 35,250 US babies named Brennan were girls.
- Boy rank, 2024
- #1,054
- Girl rank, 2024
- #6,414
- Babies named Brennan since 1916
- 35,250
- Most popular year
- 2009
- 1,550 babies
Boys and girls named Brennan, by decade
| Decade | Boys | Girls | Share girls |
|---|---|---|---|
| 1910s | 5 | 0 | 0% |
| 1920s | 0 | 0 | – |
| 1930s | 0 | 0 | – |
| 1940s | 6 | 0 | 0% |
| 1950s | 80 | 0 | 0% |
| 1960s | 394 | 0 | 0% |
| 1970s | 934 | 74 | 7.3% |
| 1980s | 2,719 | 254 | 8.5% |
| 1990s | 8,300 | 574 | 6.5% |
| 2000s | 11,745 | 649 | 5.2% |
| 2010s | 7,625 | 545 | 6.7% |
| 2020s | 1,224 | 122 | 9.1% |
Every year
| Year | Boys | Boy rank | Girls | Girl rank |
|---|---|---|---|---|
| 2024 | 207 | #1,054 | 18 | #6,414 |
| 2023 | 213 | #1,023 | 16 | #6,978 |
| 2022 | 224 | #995 | 26 | #5,043 |
| 2021 | 265 | #872 | 30 | #4,528 |
| 2020 | 315 | #764 | 32 | #4,280 |
| 2019 | 340 | #719 | 32 | #4,358 |
| 2018 | 382 | #661 | 30 | #4,575 |
| 2017 | 464 | #585 | 44 | #3,493 |
| 2016 | 549 | #534 | 35 | #4,175 |
| 2015 | 690 | #444 | 40 | #3,782 |
| 2014 | 806 | #387 | 57 | #2,973 |
| 2013 | 927 | #345 | 66 | #2,665 |
| 2012 | 1,011 | #318 | 73 | #2,499 |
| 2011 | 1,177 | #293 | 87 | #2,174 |
| 2010 | 1,279 | #270 | 81 | #2,344 |
| 2009 | 1,464 | #242 | 86 | #2,272 |
| 2008 | 1,316 | #263 | 83 | #2,338 |
| 2007 | 1,207 | #286 | 100 | #2,039 |
| 2006 | 1,116 | #299 | 69 | #2,609 |
| 2005 | 1,054 | #312 | 47 | #3,271 |
| 2004 | 1,061 | #300 | 63 | #2,624 |
| 2003 | 1,127 | #276 | 41 | #3,479 |
| 2002 | 1,121 | #273 | 58 | #2,648 |
| 2001 | 1,121 | #274 | 60 | #2,545 |
| 2000 | 1,158 | #276 | 42 | #3,222 |
| 1999 | 1,106 | #270 | 58 | #2,476 |
| 1998 | 1,051 | #274 | 65 | #2,192 |
| 1997 | 967 | #288 | 52 | #2,485 |
| 1996 | 895 | #297 | 60 | #2,232 |
| 1995 | 916 | #288 | 62 | #2,160 |
| 1994 | 756 | #329 | 76 | #1,867 |
| 1993 | 663 | #356 | 57 | #2,268 |
| 1992 | 642 | #368 | 50 | #2,520 |
| 1991 | 698 | #346 | 53 | #2,390 |
| 1990 | 606 | #384 | 41 | #2,805 |
| 1989 | 445 | #446 | 33 | #3,177 |
| 1988 | 460 | #422 | 28 | #3,401 |
| 1987 | 422 | #428 | 34 | #2,857 |
| 1986 | 292 | #520 | 30 | #3,066 |
| 1985 | 253 | #553 | 20 | #3,994 |
| 1984 | 232 | #562 | 28 | #3,079 |
| 1983 | 182 | #634 | 25 | #3,254 |
| 1982 | 152 | #706 | 19 | #4,043 |
| 1981 | 139 | #735 | 14 | #4,992 |
| 1980 | 142 | #736 | 23 | #3,519 |
| 1979 | 136 | #741 | 16 | #4,437 |
| 1978 | 123 | #760 | 16 | #4,275 |
| 1977 | 108 | #819 | 8 | #6,954 |
| 1976 | 99 | #838 | 10 | #5,635 |
| 1975 | 102 | #823 | 11 | #5,193 |
| 1974 | 89 | #850 | 7 | #6,981 |
| 1973 | 69 | #973 | 6 | #7,523 |
| 1972 | 57 | #1,069 | 0 | – |
| 1971 | 78 | #921 | 0 | – |
| 1970 | 73 | #932 | 0 | – |
| 1969 | 66 | #945 | 0 | – |
| 1968 | 58 | #959 | 0 | – |
| 1967 | 53 | #994 | 0 | – |
| 1966 | 53 | #999 | 0 | – |
| 1965 | 36 | #1,276 | 0 | – |
| 1964 | 30 | #1,436 | 0 | – |
| 1963 | 32 | #1,377 | 0 | – |
| 1962 | 24 | #1,629 | 0 | – |
| 1961 | 25 | #1,605 | 0 | – |
| 1960 | 17 | #1,976 | 0 | – |
| 1959 | 11 | #2,551 | 0 | – |
| 1958 | 14 | #2,185 | 0 | – |
| 1957 | 9 | #2,844 | 0 | – |
| 1956 | 11 | #2,515 | 0 | – |
| 1955 | 10 | #2,589 | 0 | – |
| 1954 | 8 | #2,975 | 0 | – |
| 1953 | 6 | #3,468 | 0 | – |
| 1952 | 0 | – | 0 | – |
| 1951 | 5 | #3,776 | 0 | – |
| 1950 | 6 | #3,364 | 0 | – |
| 1949 | 6 | #3,348 | 0 | – |
| 1948 | 0 | – | 0 | – |
| 1947 | 0 | – | 0 | – |
| 1946 | 0 | – | 0 | – |
| 1945 | 0 | – | 0 | – |
| 1944 | 0 | – | 0 | – |
| 1943 | 0 | – | 0 | – |
| 1942 | 0 | – | 0 | – |
| 1941 | 0 | – | 0 | – |
| 1940 | 0 | – | 0 | – |
| 1939 | 0 | – | 0 | – |
| 1938 | 0 | – | 0 | – |
| 1937 | 0 | – | 0 | – |
| 1936 | 0 | – | 0 | – |
| 1935 | 0 | – | 0 | – |
| 1934 | 0 | – | 0 | – |
| 1933 | 0 | – | 0 | – |
| 1932 | 0 | – | 0 | – |
| 1931 | 0 | – | 0 | – |
| 1930 | 0 | – | 0 | – |
| 1929 | 0 | – | 0 | – |
| 1928 | 0 | – | 0 | – |
| 1927 | 0 | – | 0 | – |
| 1926 | 0 | – | 0 | – |
| 1925 | 0 | – | 0 | – |
| 1924 | 0 | – | 0 | – |
| 1923 | 0 | – | 0 | – |
| 1922 | 0 | – | 0 | – |
| 1921 | 0 | – | 0 | – |
| 1920 | 0 | – | 0 | – |
| 1919 | 0 | – | 0 | – |
| 1918 | 0 | – | 0 | – |
| 1917 | 0 | – | 0 | – |
| 1916 | 5 | #3,973 | 0 | – |
Highest rank
As a boy name, Brennan reached #242 in 2009. As a girl name, it reached #1,867 in 1994. Ranks count every name SSA published for that year and sex, so they go well past the top 1,000.
Names from the same era
These names were also most popular in the 2000s, with a similar number of babies. They can work as sibling or middle names that feel like they belong together.
Names spelled like Brennan
Source: US Social Security Administration baby name data, 1880–2024. Counts are Social Security card applications for US births; SSA leaves out names given to fewer than 5 babies in a year. Updated 2026-10-05. How these numbers are made.