Lou is an established name used for both girls and boys that peaked in 1954 and has since faded.
Lou is predominantly a girl name. In 2025 it ranked #2,674 among girls (65) and #1,929 among boys (81) — overall #2,754 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 146 | 146 | #2,674 | #1,929 |
| 2024 | 141 | 141 | #2,521 | #2,125 |
| 2023 | 143 | 143 | #2,575 | #2,040 |
| 2022 | 138 | 138 | #2,772 | #2,013 |
| 2021 | 115 | 115 | #3,053 | #2,290 |
| 2020 | 101 | 101 | #3,527 | #2,340 |
| 2019 | 84 | 84 | #3,760 | #2,836 |
| 2018 | 71 | 71 | #3,823 | #3,488 |
| 2017 | 67 | 67 | #4,652 | #3,167 |
| 2016 | 80 | 80 | #4,208 | #2,710 |
| 2015 | 67 | 67 | #4,808 | #3,060 |
| 2014 | 49 | 49 | #5,909 | #3,854 |
| 2013 | 39 | 39 | #8,014 | #4,136 |
| 2012 | 36 | 36 | #7,045 | #5,169 |
| 2011 | 43 | 43 | #7,655 | #3,855 |
| 2010 | 27 | 27 | #10,203 | #5,633 |
| 2009 | 27 | 27 | #19,031 | #4,526 |
| 2008 | 19 | 19 | #16,659 | #6,632 |
| 2007 | 19 | 19 | #16,741 | #6,484 |
| 2006 | 29 | 29 | #12,018 | #4,619 |
| 2005 | 35 | 35 | #8,157 | #4,281 |
| 2004 | 26 | 26 | #10,380 | #5,158 |
| 2003 | 20 | 20 | #10,122 | #7,044 |
| 2002 | 21 | 21 | #11,742 | #5,604 |
| 2001 | 28 | 28 | #11,606 | #4,056 |
| 2000 | 20 | 20 | #10,391 | #6,169 |
| 1999 | 14 | 14 | #13,684 | #7,585 |
| 1998 | 19 | 19 | #10,713 | #5,693 |
| 1997 | 21 | — | #11,548 | #4,596 |
| 1996 | 14 | — | — | #4,530 |
| 1995 | 13 | — | — | #4,695 |
| 1994 | 27 | — | #11,264 | #3,415 |
| 1993 | 24 | — | #8,433 | #4,371 |
| 1992 | 28 | — | #9,190 | #3,413 |
| 1991 | 30 | — | #12,432 | #2,793 |
| 1990 | 36 | — | #7,138 | #2,747 |
| 1989 | 31 | — | #6,377 | #3,281 |
| 1988 | 21 | — | #6,919 | #4,639 |
| 1987 | 29 | — | #5,795 | #3,144 |
| 1986 | 24 | — | #5,625 | #4,027 |
| 1985 | 31 | — | #5,886 | #2,661 |
| 1984 | 38 | — | #4,095 | #2,586 |
| 1983 | 31 | — | #4,206 | #3,345 |
| 1982 | 51 | — | #3,061 | #2,313 |
| 1981 | 46 | — | #2,954 | #2,846 |
| 1980 | 42 | — | #4,079 | #2,257 |
| 1979 | 65 | — | #2,366 | #2,080 |
| 1978 | 63 | — | #2,372 | #1,998 |
| 1977 | 60 | — | #2,177 | #2,614 |
| 1976 | 68 | — | #1,896 | #2,299 |
| 1975 | 70 | — | #1,864 | #2,176 |
| 1974 | 82 | — | #1,543 | #2,245 |
| 1973 | 121 | — | #1,181 | #1,636 |
| 1972 | 126 | — | #1,108 | #1,803 |
| 1971 | 172 | — | #955 | #1,392 |
| 1970 | 199 | — | #849 | #1,326 |
| 1969 | 194 | — | #803 | #1,514 |
| 1968 | 201 | — | #770 | #1,379 |
| 1967 | 200 | — | #754 | #1,431 |
| 1966 | 225 | — | #725 | #1,212 |
| 1965 | 258 | — | #657 | #1,350 |
| 1964 | 325 | — | #599 | #1,106 |
| 1963 | 420 | — | #496 | #1,267 |
| 1962 | 443 | — | #487 | #1,130 |
| 1961 | 527 | — | #447 | #1,063 |
| 1960 | 657 | — | #389 | #949 |
| 1959 | 763 | — | #358 | #1,024 |
| 1958 | 918 | — | #314 | #932 |
| 1957 | 956 | — | #309 | #895 |
| 1956 | 1,120 | — | #259 | #1,025 |
| 1955 | 1,274 | — | #232 | #1,081 |
| 1954 | 1,547 | — | #204 | #1,042 |
| 1953 | 1,470 | — | #208 | #1,255 |
| 1952 | 609 | — | #345 | #1,178 |
| 1951 | 495 | — | #391 | #946 |
| 1950 | 445 | — | #395 | #1,306 |
| 1949 | 476 | — | #374 | #1,222 |
| 1948 | 478 | — | #379 | #1,154 |
| 1947 | 566 | — | #355 | #950 |
| 1946 | 525 | — | #343 | #995 |
| 1945 | 447 | — | #341 | #934 |
| 1944 | 501 | — | #314 | #1,080 |
| 1943 | 495 | — | #330 | #1,097 |
| 1942 | 583 | — | #293 | #981 |
| 1941 | 545 | — | #286 | #1,043 |
| 1940 | 533 | — | #281 | #1,043 |
| 1939 | 549 | — | #278 | #911 |
| 1938 | 562 | — | #274 | #1,211 |
| 1937 | 565 | — | #269 | #1,332 |
| 1936 | 532 | — | #271 | #1,309 |
| 1935 | 551 | — | #269 | #1,266 |
| 1934 | 583 | — | #263 | #1,414 |
| 1933 | 572 | — | #265 | #1,066 |
| 1932 | 585 | — | #270 | #987 |
| 1931 | 503 | — | #290 | #1,074 |
| 1930 | 496 | — | #306 | #1,383 |
| 1929 | 502 | — | #309 | #1,363 |
| 1928 | 469 | — | #320 | #1,051 |
| 1927 | 526 | — | #304 | #1,190 |
| 1926 | 446 | — | #323 | #1,370 |
| 1925 | 436 | — | #338 | #1,101 |
| 1924 | 418 | — | #349 | #1,199 |
| 1923 | 378 | — | #358 | #1,229 |
| 1922 | 390 | — | #349 | #1,130 |
| 1921 | 348 | — | #377 | #1,435 |
| 1920 | 369 | — | #357 | #1,267 |
| 1919 | 334 | — | #361 | #1,674 |
| 1918 | 402 | — | #335 | #1,278 |
| 1917 | 383 | — | #338 | #975 |
| 1916 | 347 | — | #351 | #1,036 |
| 1915 | 316 | — | #354 | #1,175 |
| 1914 | 265 | — | #348 | #894 |
| 1913 | 216 | — | #342 | #1,293 |
| 1912 | 234 | — | #315 | #981 |
| 1911 | 162 | — | #317 | #1,249 |
| 1910 | 162 | — | #318 | #723 |
| 1909 | 140 | — | #307 | — |
| 1908 | 162 | — | #293 | #701 |
| 1907 | 136 | — | #313 | #798 |
| 1906 | 100 | — | #334 | — |
| 1905 | 156 | — | #276 | #688 |
| 1904 | 124 | — | #297 | #1,028 |
| 1903 | 144 | — | #266 | #722 |
| 1902 | 127 | — | #286 | #1,094 |
| 1901 | 103 | — | #304 | #906 |
| 1900 | 153 | — | #275 | #718 |
| 1899 | 138 | — | #253 | #569 |
| 1898 | 166 | — | #236 | #726 |
| 1897 | 127 | — | #267 | #601 |
| 1896 | 140 | — | #247 | #759 |
| 1895 | 134 | — | #253 | #774 |
| 1894 | 130 | — | #253 | #615 |
| 1893 | 147 | — | #223 | #683 |
| 1892 | 146 | — | #222 | #778 |
| 1891 | 117 | — | #231 | #741 |
| 1890 | 141 | — | #210 | #710 |
| 1889 | 137 | — | #210 | #453 |
| 1888 | 179 | — | #173 | #679 |
| 1887 | 157 | — | #167 | #615 |
| 1886 | 138 | — | #178 | #674 |
| 1885 | 148 | — | #158 | #537 |
| 1884 | 156 | — | #145 | #644 |
| 1883 | 153 | — | #136 | #577 |
| 1882 | 141 | — | #137 | #627 |
| 1881 | 129 | — | #138 | #452 |
| 1880 | 145 | — | #125 | #492 |