The baby name Unknown appears in baby name data for the United States from 1917 to 2024. It was most popular in 1954 with 771 babies given the name.
In the later years of this period, Unknown has become more popular compared with earlier years.
| Year | Count |
|---|---|
| 1917 | 5 |
| 1925 | 5 |
| 1942 | 6 |
| 1943 | 13 |
| 1944 | 39 |
| 1944 | 5 |
| 1945 | 19 |
| 1945 | 17 |
| 1946 | 75 |
| 1946 | 9 |
| 1947 | 126 |
| 1947 | 92 |
| 1948 | 282 |
| 1948 | 165 |
| 1949 | 434 |
| 1949 | 308 |
| 1950 | 552 |
| 1950 | 469 |
| 1951 | 601 |
| 1951 | 522 |
| 1952 | 727 |
| 1952 | 596 |
| 1953 | 735 |
| 1953 | 745 |
| 1954 | 771 |
| 1954 | 764 |
| 1955 | 688 |
| 1955 | 659 |
| 1956 | 633 |
| 1956 | 587 |
| 1957 | 387 |
| 1957 | 501 |
| 1958 | 213 |
| 1958 | 308 |
| 1959 | 123 |
| 1959 | 203 |
| 1960 | 115 |
| 1960 | 210 |
| 1961 | 69 |
| 1961 | 156 |
| 1962 | 6 |
| 1962 | 107 |
| 1963 | 37 |
| 1963 | 48 |
| 1964 | 20 |
| 1964 | 38 |
| 1965 | 27 |
| 1965 | 5 |
| 1966 | 20 |
| 1967 | 10 |
| 1967 | 21 |
| 1968 | 10 |
| 1968 | 10 |
| 1969 | 15 |
| 1970 | 11 |
| 1971 | 5 |
| 1973 | 24 |
| 1973 | 9 |
| 1974 | 5 |
| 1987 | 7 |
| 1987 | 5 |
| 1988 | 94 |
| 1988 | 80 |
| 1989 | 262 |
| 1989 | 246 |
| 1990 | 173 |
| 1990 | 172 |
| 1991 | 136 |
| 1991 | 311 |
| 1992 | 157 |
| 1992 | 175 |
| 1993 | 92 |
| 1993 | 138 |
| 1994 | 149 |
| 1994 | 230 |
| 1995 | 356 |
| 1995 | 248 |
| 1996 | 34 |
| 1996 | 40 |
| 1997 | 13 |
| 1998 | 5 |
| 1999 | 24 |
| 1999 | 12 |
| 2000 | 38 |
| 2000 | 42 |
| 2001 | 20 |
| 2002 | 10 |
| 2002 | 32 |
| 2003 | 12 |
| 2003 | 12 |
| 2004 | 17 |
| 2005 | 12 |
| 2005 | 15 |
| 2006 | 10 |
| 2007 | 32 |
| 2007 | 22 |
| 2008 | 84 |
| 2008 | 94 |
| 2009 | 106 |
| 2009 | 136 |
| 2010 | 74 |
| 2010 | 95 |
| 2011 | 130 |
| 2011 | 104 |
| 2012 | 152 |
| 2012 | 116 |
| 2013 | 108 |
| 2013 | 145 |
| 2014 | 120 |
| 2014 | 127 |
| 2015 | 48 |
| 2015 | 99 |
| 2016 | 35 |
| 2016 | 66 |
| 2017 | 24 |
| 2017 | 65 |
| 2018 | 58 |
| 2018 | 106 |
| 2019 | 38 |
| 2019 | 108 |
| 2020 | 34 |
| 2020 | 49 |
| 2021 | 40 |
| 2021 | 86 |
| 2022 | 35 |
| 2022 | 28 |
| 2023 | 27 |
| 2023 | 29 |
| 2024 | 26 |
| 2024 | 33 |