Unknown is an established name used for both girls and boys that peaked in 1954 and has since faded.
Unknown is predominantly a boy name. In 2025 it ranked #2,757 among boys (47) and #3,293 among girls (48) — overall #3,683 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 95 | 95 | #3,293 | #2,757 |
| 2024 | 81 | 81 | #3,956 | #2,953 |
| 2023 | 126 | 126 | #3,471 | #1,951 |
| 2022 | 137 | 137 | #3,162 | #1,873 |
| 2021 | 134 | 134 | #3,294 | #1,838 |
| 2020 | 103 | 103 | #3,603 | #2,260 |
| 2019 | 130 | 130 | #3,081 | #1,933 |
| 2018 | 151 | 151 | #2,644 | #1,806 |
| 2017 | 114 | 114 | #3,381 | #2,089 |
| 2016 | 87 | 87 | #4,075 | #2,549 |
| 2015 | 103 | 103 | #3,647 | #2,251 |
| 2014 | 151 | 151 | #2,516 | #1,871 |
| 2013 | 165 | 165 | #2,623 | #1,603 |
| 2012 | 163 | 163 | #2,767 | #1,597 |
| 2011 | 164 | 164 | #2,414 | #1,716 |
| 2010 | 154 | 154 | #2,751 | #1,724 |
| 2009 | 198 | 198 | #2,336 | #1,470 |
| 2008 | 135 | 135 | #2,885 | #1,967 |
| 2007 | 73 | 73 | #4,802 | #2,863 |
| 2006 | 41 | 41 | #7,851 | #3,993 |
| 2005 | 48 | 48 | #5,251 | #4,052 |
| 2004 | 44 | 44 | #6,204 | #3,853 |
| 2003 | 61 | 61 | #4,411 | #3,112 |
| 2002 | 45 | 45 | #6,378 | #3,341 |
| 2001 | 43 | 43 | #4,440 | #5,132 |
| 2000 | 81 | 81 | #3,267 | #2,475 |
| 1999 | 42 | 42 | #4,436 | #4,528 |
| 1998 | 33 | 33 | #5,791 | #4,635 |
| 1997 | 50 | — | #6,156 | #2,444 |
| 1996 | 106 | — | #2,450 | #1,762 |
| 1995 | 471 | — | #866 | #667 |
| 1994 | 324 | — | #1,124 | #839 |
| 1993 | 215 | — | #1,628 | #990 |
| 1992 | 290 | — | #1,272 | #853 |
| 1991 | 557 | — | #796 | #588 |
| 1990 | 354 | — | #1,092 | #738 |
| 1989 | 513 | — | #774 | #610 |
| 1988 | 162 | — | #1,838 | #1,011 |
| 1987 | 33 | — | #4,656 | #3,330 |
| 1986 | 17 | — | #8,491 | #4,829 |
| 1985 | 11 | — | — | #4,035 |
| 1984 | 12 | — | #9,108 | #7,289 |
| 1983 | 20 | — | #5,808 | #4,878 |
| 1982 | 28 | — | #4,709 | #3,674 |
| 1981 | 29 | — | #6,305 | #2,676 |
| 1980 | 16 | — | #9,062 | #4,475 |
| 1979 | 22 | — | #6,677 | #3,557 |
| 1978 | 19 | — | #6,928 | #3,837 |
| 1977 | 25 | — | #5,523 | #3,190 |
| 1976 | 30 | — | #3,956 | #3,087 |
| 1975 | 39 | — | #3,395 | #2,447 |
| 1974 | 28 | — | #6,874 | #2,193 |
| 1973 | 43 | — | #3,012 | #2,119 |
| 1972 | 29 | — | #4,290 | #2,528 |
| 1971 | 51 | — | #3,643 | #1,524 |
| 1970 | 60 | — | #3,569 | #1,295 |
| 1969 | 51 | — | #2,839 | #1,564 |
| 1968 | 50 | — | #3,050 | #1,425 |
| 1967 | 59 | — | #3,074 | #1,180 |
| 1966 | 74 | — | #2,021 | #1,192 |
| 1965 | 64 | — | #2,245 | #1,316 |
| 1964 | 93 | — | #1,779 | #1,093 |
| 1963 | 125 | — | #1,546 | #890 |
| 1962 | 162 | — | #1,493 | #747 |
| 1961 | 264 | — | #1,124 | #614 |
| 1960 | 327 | — | #925 | #564 |
| 1959 | 333 | — | #851 | #569 |
| 1958 | 478 | — | #685 | #479 |
| 1957 | 714 | — | #533 | #386 |
| 1956 | 997 | — | #384 | #346 |
| 1955 | 1,061 | — | #368 | #332 |
| 1954 | 1,192 | — | #336 | #308 |
| 1953 | 1,125 | — | #338 | #313 |
| 1952 | 1,110 | — | #330 | #321 |
| 1951 | 1,004 | — | #334 | #328 |
| 1950 | 915 | — | #348 | #336 |
| 1949 | 721 | — | #373 | #402 |
| 1948 | 457 | — | #469 | #520 |
| 1947 | 247 | — | #696 | #697 |
| 1946 | 147 | — | #814 | #1,058 |
| 1945 | 96 | — | #1,077 | #993 |
| 1944 | 87 | — | #1,015 | #1,310 |
| 1943 | 86 | — | #1,076 | #1,279 |
| 1942 | 43 | — | #1,555 | #2,038 |
| 1941 | 26 | — | #2,092 | #2,641 |
| 1940 | 25 | — | #1,894 | #3,439 |
| 1939 | 19 | — | #2,573 | #3,091 |
| 1938 | 15 | — | #2,921 | #4,000 |
| 1937 | 19 | — | #2,441 | #3,499 |
| 1936 | 10 | — | #2,842 | — |
| 1935 | 18 | — | #2,559 | #3,617 |
| 1934 | 16 | — | #3,136 | #3,256 |
| 1933 | 13 | — | #3,716 | #3,610 |
| 1932 | 22 | — | #2,356 | #3,076 |
| 1931 | 19 | — | #2,417 | #3,730 |
| 1930 | 23 | — | #3,036 | #2,284 |
| 1929 | 20 | — | #3,123 | #2,750 |
| 1928 | 22 | — | #2,753 | #2,833 |
| 1927 | 18 | — | #3,039 | #3,755 |
| 1926 | 20 | — | #4,269 | #2,424 |
| 1925 | 28 | — | #4,921 | #1,675 |
| 1924 | 17 | — | #3,363 | #3,841 |
| 1923 | 29 | — | #5,667 | #1,587 |
| 1922 | 32 | — | #2,596 | #1,946 |
| 1921 | 32 | — | #2,924 | #1,825 |
| 1920 | 27 | — | #3,571 | #1,956 |
| 1919 | 41 | — | #2,628 | #1,380 |
| 1918 | 51 | — | #1,955 | #1,283 |
| 1917 | 41 | — | #1,917 | #1,583 |
| 1916 | 37 | — | #2,487 | #1,457 |
| 1915 | 43 | — | #1,792 | #1,406 |
| 1914 | 29 | — | #2,249 | #1,483 |
| 1913 | 28 | — | #2,020 | #1,309 |
| 1912 | 27 | — | #1,713 | #1,259 |
| 1911 | 24 | — | #2,834 | #756 |
| 1910 | 13 | — | — | #924 |
| 1909 | 6 | — | — | #1,429 |
| 1908 | 13 | — | #2,404 | #1,105 |
| 1907 | 20 | — | #1,631 | #809 |
| 1906 | 9 | — | — | #919 |
| 1905 | 20 | — | #1,233 | #916 |
| 1904 | 17 | — | #1,245 | #1,057 |
| 1903 | 12 | — | #1,776 | #1,122 |
| 1902 | 23 | — | #1,579 | #554 |
| 1901 | 15 | — | #1,659 | #777 |
| 1900 | 31 | — | #1,005 | #648 |
| 1899 | 18 | — | #1,092 | #850 |
| 1898 | 22 | — | #1,492 | #570 |
| 1897 | 16 | — | #1,376 | #783 |
| 1896 | 15 | — | #1,570 | #819 |
| 1895 | 9 | — | — | #790 |
| 1894 | 20 | — | #1,228 | #627 |
| 1893 | 7 | — | — | #899 |
| 1892 | 14 | — | — | #571 |
| 1891 | 9 | — | — | #698 |
| 1890 | 12 | — | #1,195 | #1,151 |
| 1889 | 14 | — | #1,018 | #966 |
| 1888 | 6 | — | — | #1,022 |
| 1887 | 5 | — | — | #1,059 |
| 1886 | 5 | — | #1,276 | — |
| 1885 | 7 | — | — | #830 |
| 1883 | 7 | — | — | #793 |
| 1882 | 7 | — | — | #831 |
| 1881 | 8 | — | — | #700 |
| 1880 | 5 | — | — | #1,049 |