Lenny is an uncommon variant of Leon that peaked in 1960 and remains in steady use.
Lenny is predominantly a boy name. In 2025 it ranked #1,419 among boys (128) and #2,799 among girls (61) — overall #2,297 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 189 | 189 | #2,799 | #1,419 |
| 2024 | 193 | 193 | #2,962 | #1,377 |
| 2023 | 183 | 183 | #3,251 | #1,393 |
| 2022 | 165 | 165 | #3,629 | #1,488 |
| 2021 | 155 | 155 | #3,648 | #1,549 |
| 2020 | 123 | 123 | #4,832 | #1,668 |
| 2019 | 129 | 129 | #5,393 | #1,588 |
| 2018 | 119 | 119 | #5,258 | #1,685 |
| 2017 | 119 | 119 | #5,603 | #1,656 |
| 2016 | 134 | 134 | #9,183 | #1,428 |
| 2015 | 178 | 178 | #8,727 | #1,144 |
| 2014 | 103 | 103 | #13,947 | #1,621 |
| 2013 | 121 | 121 | #15,730 | #1,441 |
| 2012 | 119 | 119 | — | #1,404 |
| 2011 | 144 | 144 | #18,392 | #1,247 |
| 2010 | 153 | 153 | #11,828 | #1,229 |
| 2009 | 105 | 105 | #14,586 | #1,621 |
| 2008 | 111 | 117 | #12,177 | #1,570 |
| 2007 | 105 | 105 | #16,697 | #1,589 |
| 2006 | 114 | 114 | #11,086 | #1,473 |
| 2005 | 88 | 88 | — | #1,580 |
| 2004 | 91 | 97 | #10,365 | #1,614 |
| 2003 | 67 | 67 | #13,248 | #1,952 |
| 2002 | 92 | 92 | #9,209 | #1,540 |
| 2001 | 64 | 64 | — | #1,773 |
| 2000 | 62 | 70 | — | #1,775 |
| 1999 | 48 | 60 | — | #2,012 |
| 1998 | 62 | 62 | #15,497 | #1,783 |
| 1997 | 32 | — | #15,096 | #2,873 |
| 1996 | 38 | — | #14,814 | #2,407 |
| 1995 | 66 | — | #6,867 | #1,695 |
| 1994 | 61 | — | #14,738 | #1,636 |
| 1993 | 69 | — | #10,141 | #1,519 |
| 1992 | 43 | — | — | #1,897 |
| 1991 | 70 | — | #9,849 | #1,448 |
| 1990 | 62 | — | #10,873 | #1,541 |
| 1989 | 53 | — | — | #1,541 |
| 1988 | 48 | — | — | #1,539 |
| 1987 | 61 | — | — | #1,255 |
| 1986 | 66 | — | — | #1,168 |
| 1985 | 60 | — | #7,973 | #1,341 |
| 1984 | 43 | — | — | #1,474 |
| 1983 | 77 | — | #11,212 | #1,043 |
| 1982 | 103 | — | #11,473 | #905 |
| 1981 | 77 | — | — | #1,041 |
| 1980 | 95 | — | — | #914 |
| 1979 | 142 | — | #9,626 | #743 |
| 1978 | 118 | — | — | #776 |
| 1977 | 130 | — | — | #749 |
| 1976 | 150 | — | #5,413 | #707 |
| 1975 | 155 | — | #4,469 | #701 |
| 1974 | 91 | — | — | #846 |
| 1973 | 97 | — | #7,079 | #840 |
| 1972 | 117 | — | #5,719 | #769 |
| 1971 | 121 | — | — | #743 |
| 1970 | 123 | — | #8,715 | #760 |
| 1969 | 122 | — | #6,315 | #728 |
| 1968 | 119 | — | — | #694 |
| 1967 | 118 | — | — | #686 |
| 1966 | 132 | — | — | #646 |
| 1965 | 137 | — | #7,078 | #650 |
| 1964 | 152 | — | — | #632 |
| 1963 | 179 | — | #6,251 | #598 |
| 1962 | 184 | — | #5,583 | #587 |
| 1961 | 206 | — | #5,609 | #556 |
| 1960 | 209 | — | #3,818 | #561 |
| 1959 | 172 | — | #4,840 | #605 |
| 1958 | 153 | — | — | #622 |
| 1957 | 162 | — | #6,615 | #614 |
| 1956 | 121 | — | #4,049 | #704 |
| 1955 | 96 | — | #6,320 | #764 |
| 1954 | 95 | — | #5,476 | #756 |
| 1953 | 77 | — | #5,392 | #855 |
| 1952 | 69 | — | #4,730 | #899 |
| 1951 | 55 | — | #4,215 | #1,047 |
| 1950 | 49 | — | — | #998 |
| 1949 | 59 | — | — | #900 |
| 1948 | 87 | — | #3,485 | #777 |
| 1947 | 78 | — | #3,586 | #840 |
| 1946 | 81 | — | #2,966 | #802 |
| 1945 | 56 | — | — | #843 |
| 1944 | 56 | — | #3,256 | #941 |
| 1943 | 49 | — | #4,014 | #1,045 |
| 1942 | 32 | — | — | #1,238 |
| 1941 | 26 | — | — | #1,321 |
| 1940 | 35 | — | — | #1,118 |
| 1939 | 22 | — | — | #1,442 |
| 1938 | 20 | — | — | #1,545 |
| 1937 | 16 | — | — | #1,798 |
| 1936 | 12 | — | — | #2,132 |
| 1935 | 15 | — | — | #1,884 |
| 1934 | 13 | — | — | #2,082 |
| 1933 | 7 | — | — | #3,162 |
| 1931 | 6 | — | — | #3,604 |
| 1929 | 7 | — | — | #3,418 |
| 1926 | 6 | — | — | #3,993 |
| 1925 | 8 | — | — | #3,284 |
| 1924 | 5 | — | — | #4,706 |
| 1923 | 8 | — | — | #3,330 |
| 1920 | 7 | — | — | #3,676 |
| 1919 | 8 | — | — | #3,270 |
| 1914 | 5 | — | — | #3,542 |