Len is an uncommon variant of Leon that peaked in 1958 and has since faded.
Len is predominantly a boy name. In 2025 it ranked #9,377 for boy births in the United States (and #19,362 across all names), given to 8 babies. Len was first reported in SSA data in 1880 and peaked in 1960 (121 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 8 | 8 | — | #9,377 |
| 2024 | 8 | 8 | — | #9,511 |
| 2023 | 12 | 12 | — | #7,128 |
| 2022 | 11 | 11 | — | #7,547 |
| 2021 | 7 | 7 | — | #10,356 |
| 2020 | 7 | 7 | — | #10,178 |
| 2019 | 9 | 9 | — | #8,608 |
| 2018 | 10 | 10 | — | #7,935 |
| 2017 | 8 | 8 | — | #9,365 |
| 2016 | 10 | 10 | — | #7,923 |
| 2015 | 12 | 12 | — | #6,918 |
| 2014 | 15 | 15 | — | #5,891 |
| 2013 | 8 | 8 | — | #9,317 |
| 2012 | 14 | 14 | — | #6,195 |
| 2011 | 9 | 9 | — | #8,500 |
| 2010 | 13 | 13 | — | #6,582 |
| 2009 | 12 | 12 | — | #7,074 |
| 2008 | 5 | 5 | — | #13,766 |
| 2007 | 10 | 10 | — | #7,944 |
| 2006 | 12 | 12 | — | #6,730 |
| 2005 | 11 | 11 | — | #6,914 |
| 2004 | 9 | 9 | — | #7,927 |
| 2003 | 10 | 10 | — | #7,039 |
| 2002 | 5 | 5 | — | #11,760 |
| 2001 | 8 | 8 | — | #8,014 |
| 2000 | 12 | 12 | — | #5,770 |
| 1999 | 8 | 8 | — | #7,571 |
| 1998 | 10 | 10 | — | #6,120 |
| 1997 | 12 | — | — | #5,151 |
| 1996 | 13 | — | — | #4,783 |
| 1995 | 13 | — | — | #4,687 |
| 1994 | 10 | — | — | #5,722 |
| 1993 | 9 | — | — | #6,037 |
| 1992 | 9 | — | — | #5,933 |
| 1991 | 15 | — | — | #3,940 |
| 1990 | 14 | — | — | #4,105 |
| 1989 | 20 | — | — | #3,043 |
| 1988 | 15 | — | — | #3,454 |
| 1987 | 21 | — | — | #2,610 |
| 1986 | 18 | — | — | #2,848 |
| 1985 | 24 | — | — | #2,266 |
| 1984 | 16 | — | — | #2,895 |
| 1983 | 23 | — | — | #2,249 |
| 1982 | 22 | — | — | #2,309 |
| 1981 | 23 | — | — | #2,243 |
| 1980 | 26 | — | — | #2,087 |
| 1979 | 29 | — | — | #1,891 |
| 1978 | 27 | — | — | #1,901 |
| 1977 | 30 | — | — | #1,763 |
| 1976 | 44 | — | — | #1,340 |
| 1975 | 32 | — | — | #1,611 |
| 1974 | 38 | — | — | #1,401 |
| 1973 | 55 | — | — | #1,102 |
| 1972 | 59 | — | #8,994 | #1,116 |
| 1971 | 71 | — | — | #971 |
| 1970 | 119 | — | #8,711 | #773 |
| 1969 | 89 | — | — | #818 |
| 1968 | 90 | — | #7,635 | #806 |
| 1967 | 71 | — | — | #852 |
| 1966 | 71 | — | — | #868 |
| 1965 | 77 | — | — | #842 |
| 1964 | 100 | — | #4,513 | #795 |
| 1963 | 89 | — | — | #805 |
| 1962 | 102 | — | #5,107 | #789 |
| 1961 | 116 | — | #5,607 | #739 |
| 1960 | 121 | — | — | #713 |
| 1959 | 105 | — | #4,480 | #783 |
| 1958 | 125 | — | #5,789 | #690 |
| 1957 | 102 | — | #4,731 | #775 |
| 1956 | 85 | — | #5,652 | #845 |
| 1955 | 77 | — | — | #841 |
| 1954 | 70 | — | — | #883 |
| 1953 | 86 | — | #4,421 | #817 |
| 1952 | 99 | — | #4,728 | #736 |
| 1951 | 58 | — | — | #925 |
| 1950 | 74 | — | #4,156 | #841 |
| 1949 | 61 | — | #5,662 | #931 |
| 1948 | 76 | — | — | #787 |
| 1947 | 83 | — | — | #757 |
| 1946 | 65 | — | — | #815 |
| 1945 | 54 | — | — | #857 |
| 1944 | 49 | — | — | #913 |
| 1943 | 44 | — | — | #1,013 |
| 1942 | 37 | — | — | #1,129 |
| 1941 | 49 | — | — | #913 |
| 1940 | 47 | — | — | #935 |
| 1939 | 43 | — | — | #964 |
| 1938 | 38 | — | — | #1,054 |
| 1937 | 34 | — | — | #1,138 |
| 1936 | 32 | — | — | #1,176 |
| 1935 | 38 | — | — | #1,052 |
| 1934 | 34 | — | — | #1,141 |
| 1933 | 28 | — | — | #1,265 |
| 1932 | 44 | — | #4,774 | #1,082 |
| 1931 | 38 | — | — | #1,109 |
| 1930 | 36 | — | — | #1,185 |
| 1929 | 32 | — | — | #1,254 |
| 1928 | 36 | — | — | #1,203 |
| 1927 | 24 | — | — | #1,582 |
| 1926 | 28 | — | — | #1,394 |
| 1925 | 29 | — | — | #1,379 |
| 1924 | 26 | — | — | #1,515 |
| 1923 | 30 | — | — | #1,346 |
| 1922 | 32 | — | — | #1,299 |
| 1921 | 33 | — | — | #1,287 |
| 1920 | 44 | — | — | #1,060 |
| 1919 | 31 | — | — | #1,288 |
| 1918 | 34 | — | — | #1,205 |
| 1917 | 34 | — | — | #1,161 |
| 1916 | 31 | — | — | #1,193 |
| 1915 | 28 | — | — | #1,254 |
| 1914 | 20 | — | — | #1,371 |
| 1913 | 22 | — | — | #1,096 |
| 1912 | 24 | — | — | #926 |
| 1911 | 8 | — | — | #1,344 |
| 1910 | 10 | — | — | #1,085 |
| 1909 | 11 | — | — | #930 |
| 1907 | 14 | — | — | #724 |
| 1906 | 14 | — | — | #663 |
| 1905 | 11 | — | — | #774 |
| 1904 | 9 | — | — | #851 |
| 1903 | 9 | — | — | #823 |
| 1902 | 9 | — | — | #832 |
| 1900 | 10 | — | — | #877 |
| 1899 | 7 | — | — | #911 |
| 1898 | 7 | — | — | #950 |
| 1897 | 6 | — | — | #1,016 |
| 1896 | 13 | — | — | #612 |
| 1894 | 8 | — | — | #827 |
| 1893 | 6 | — | — | #977 |
| 1892 | 7 | — | — | #913 |
| 1890 | 11 | — | — | #622 |
| 1889 | 6 | — | — | #934 |
| 1888 | 10 | — | — | #677 |
| 1887 | 8 | — | — | #716 |
| 1886 | 6 | — | — | #912 |
| 1885 | 14 | — | — | #514 |
| 1884 | 10 | — | — | #641 |
| 1883 | 10 | — | — | #619 |
| 1882 | 9 | — | — | #678 |
| 1881 | 11 | — | — | #547 |
| 1880 | 7 | — | — | #780 |