Rex is a familiar boys' name that peaked in 1952 and has since faded.
Rex is predominantly a boy name. In 2025 it ranked #859 for boy births in the United States (and #1,775 across all names), given to 281 babies. Rex was first reported in SSA data in 1880 and peaked in 1951 (1,503 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 281 | 281 | — | #859 |
| 2024 | 320 | 320 | — | #787 |
| 2023 | 368 | 368 | — | #722 |
| 2022 | 380 | 380 | — | #697 |
| 2021 | 380 | 380 | — | #698 |
| 2020 | 377 | 377 | — | #683 |
| 2019 | 410 | 410 | — | #651 |
| 2018 | 421 | 421 | — | #631 |
| 2017 | 434 | 434 | — | #607 |
| 2016 | 423 | 423 | — | #633 |
| 2015 | 374 | 374 | — | #680 |
| 2014 | 389 | 389 | — | #661 |
| 2013 | 391 | 391 | — | #630 |
| 2012 | 385 | 385 | — | #631 |
| 2011 | 386 | 386 | — | #618 |
| 2010 | 332 | 332 | — | #704 |
| 2009 | 303 | 303 | — | #756 |
| 2008 | 274 | 274 | — | #801 |
| 2007 | 236 | 236 | — | #875 |
| 2006 | 252 | 252 | — | #810 |
| 2005 | 237 | 237 | — | #808 |
| 2004 | 182 | 182 | — | #933 |
| 2003 | 182 | 182 | — | #916 |
| 2002 | 154 | 154 | — | #1,011 |
| 2001 | 116 | 116 | — | #1,184 |
| 2000 | 112 | 112 | — | #1,213 |
| 1999 | 137 | 137 | — | #1,017 |
| 1998 | 151 | 151 | — | #938 |
| 1997 | 152 | — | — | #905 |
| 1996 | 139 | — | — | #941 |
| 1995 | 157 | — | — | #869 |
| 1994 | 167 | — | — | #826 |
| 1993 | 178 | — | — | #795 |
| 1992 | 207 | — | — | #718 |
| 1991 | 220 | — | — | #684 |
| 1990 | 232 | — | — | #664 |
| 1989 | 224 | — | — | #670 |
| 1988 | 247 | — | — | #596 |
| 1987 | 231 | — | — | #600 |
| 1986 | 232 | — | — | #585 |
| 1985 | 261 | — | — | #545 |
| 1984 | 264 | — | #10,052 | #537 |
| 1983 | 246 | — | — | #533 |
| 1982 | 265 | — | — | #525 |
| 1981 | 268 | — | — | #517 |
| 1980 | 305 | — | #11,690 | #488 |
| 1979 | 267 | — | #8,737 | #525 |
| 1978 | 255 | — | — | #512 |
| 1977 | 291 | — | — | #473 |
| 1976 | 283 | — | — | #467 |
| 1975 | 296 | — | — | #469 |
| 1974 | 297 | — | — | #466 |
| 1973 | 324 | — | — | #434 |
| 1972 | 373 | — | — | #408 |
| 1971 | 473 | — | — | #370 |
| 1970 | 507 | — | — | #362 |
| 1969 | 478 | — | — | #362 |
| 1968 | 515 | — | — | #339 |
| 1967 | 581 | — | — | #306 |
| 1966 | 718 | — | — | #275 |
| 1965 | 787 | — | — | #264 |
| 1964 | 964 | — | #5,879 | #247 |
| 1963 | 983 | — | — | #245 |
| 1962 | 1,133 | — | — | #227 |
| 1961 | 1,279 | — | #4,476 | #219 |
| 1960 | 1,320 | — | #6,239 | #214 |
| 1959 | 1,288 | — | #7,012 | #216 |
| 1958 | 1,251 | — | #4,809 | #213 |
| 1957 | 1,333 | — | #5,273 | #203 |
| 1956 | 1,458 | — | #5,811 | #193 |
| 1955 | 1,400 | — | — | #191 |
| 1954 | 1,385 | — | #6,440 | #189 |
| 1953 | 1,351 | — | #5,532 | #188 |
| 1952 | 1,505 | — | #4,830 | #174 |
| 1951 | 1,503 | — | — | #170 |
| 1950 | 1,069 | — | — | #196 |
| 1949 | 959 | — | — | #207 |
| 1948 | 904 | — | — | #210 |
| 1947 | 846 | — | — | #220 |
| 1946 | 662 | — | — | #236 |
| 1945 | 486 | — | — | #269 |
| 1944 | 574 | — | — | #234 |
| 1943 | 614 | — | — | #235 |
| 1942 | 527 | — | #4,531 | #257 |
| 1941 | 558 | — | — | #231 |
| 1940 | 552 | — | #4,897 | #228 |
| 1939 | 564 | — | — | #216 |
| 1938 | 628 | — | — | #202 |
| 1937 | 601 | — | — | #203 |
| 1936 | 612 | — | — | #201 |
| 1935 | 653 | — | #4,122 | #198 |
| 1934 | 631 | — | — | #197 |
| 1933 | 626 | — | — | #194 |
| 1932 | 586 | — | #4,324 | #213 |
| 1931 | 520 | — | — | #227 |
| 1930 | 540 | — | — | #235 |
| 1929 | 492 | — | — | #252 |
| 1928 | 525 | — | #4,616 | #242 |
| 1927 | 526 | — | #3,811 | #251 |
| 1926 | 552 | — | — | #239 |
| 1925 | 562 | — | #3,610 | #238 |
| 1924 | 594 | — | #5,743 | #229 |
| 1923 | 584 | — | — | #225 |
| 1922 | 615 | — | — | #216 |
| 1921 | 596 | — | #5,717 | #226 |
| 1920 | 614 | — | — | #210 |
| 1919 | 523 | — | — | #232 |
| 1918 | 509 | — | — | #235 |
| 1917 | 471 | — | — | #230 |
| 1916 | 461 | — | — | #231 |
| 1915 | 401 | — | — | #243 |
| 1914 | 334 | — | — | #233 |
| 1913 | 243 | — | — | #242 |
| 1912 | 164 | — | — | #279 |
| 1911 | 82 | — | — | #294 |
| 1910 | 65 | — | — | #309 |
| 1909 | 68 | — | — | #273 |
| 1908 | 64 | — | — | #268 |
| 1907 | 48 | — | — | #309 |
| 1906 | 61 | — | — | #255 |
| 1905 | 46 | — | — | #298 |
| 1904 | 33 | — | — | #352 |
| 1903 | 43 | — | — | #291 |
| 1902 | 46 | — | — | #280 |
| 1901 | 29 | — | — | #346 |
| 1900 | 59 | — | — | #268 |
| 1899 | 29 | — | — | #335 |
| 1898 | 39 | — | — | #304 |
| 1897 | 31 | — | — | #337 |
| 1896 | 35 | — | — | #322 |
| 1895 | 34 | — | — | #314 |
| 1894 | 30 | — | — | #330 |
| 1893 | 25 | — | — | #366 |
| 1892 | 28 | — | — | #368 |
| 1891 | 24 | — | — | #358 |
| 1890 | 30 | — | — | #320 |
| 1889 | 23 | — | — | #377 |
| 1888 | 28 | — | — | #351 |
| 1887 | 28 | — | — | #319 |
| 1886 | 26 | — | — | #335 |
| 1885 | 17 | — | — | #456 |
| 1884 | 13 | — | — | #540 |
| 1883 | 15 | — | — | #476 |
| 1882 | 13 | — | — | #537 |
| 1881 | 7 | — | — | #768 |
| 1880 | 13 | — | — | #519 |