Lenn is a rare variant of Leon that peaked in 1950 and has since faded.
Lenn is predominantly a boy name. It last appears in U.S. records in 2019. Lenn first appears in 1913 and peaked in 1956 (18 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2019 | 7 | 7 | — | #10,386 |
| 1985 | 5 | — | — | #7,147 |
| 1984 | 9 | — | — | #4,414 |
| 1982 | 6 | — | — | #6,086 |
| 1981 | 6 | — | — | #5,946 |
| 1979 | 7 | — | — | #5,151 |
| 1977 | 9 | — | — | #4,026 |
| 1976 | 6 | — | — | #5,333 |
| 1975 | 6 | — | — | #5,178 |
| 1974 | 8 | — | — | #4,041 |
| 1973 | 9 | — | — | #3,596 |
| 1972 | 8 | — | — | #3,824 |
| 1971 | 9 | — | — | #3,548 |
| 1970 | 7 | — | — | #4,080 |
| 1969 | 9 | — | — | #3,218 |
| 1968 | 10 | — | — | #2,835 |
| 1967 | 8 | — | — | #3,131 |
| 1966 | 12 | — | — | #2,402 |
| 1965 | 12 | — | — | #2,422 |
| 1964 | 8 | — | — | #3,175 |
| 1963 | 11 | — | — | #2,614 |
| 1962 | 13 | — | — | #2,320 |
| 1961 | 16 | — | — | #2,110 |
| 1960 | 14 | — | — | #2,269 |
| 1959 | 14 | — | — | #2,255 |
| 1958 | 15 | — | — | #2,134 |
| 1957 | 11 | — | — | #2,575 |
| 1956 | 18 | — | — | #1,916 |
| 1955 | 10 | — | — | #2,685 |
| 1954 | 16 | — | — | #2,010 |
| 1953 | 17 | — | — | #1,929 |
| 1952 | 16 | — | — | #1,983 |
| 1951 | 17 | — | — | #1,879 |
| 1950 | 21 | — | #5,031 | #1,982 |
| 1949 | 9 | — | — | #2,717 |
| 1948 | 8 | — | — | #2,919 |
| 1947 | 9 | — | — | #2,782 |
| 1944 | 7 | — | — | #3,006 |
| 1943 | 7 | — | — | #3,108 |
| 1942 | 8 | — | — | #2,830 |
| 1939 | 9 | — | — | #2,547 |
| 1938 | 5 | — | — | #3,814 |
| 1936 | 7 | — | — | #3,036 |
| 1934 | 10 | — | — | #2,489 |
| 1933 | 6 | — | — | #3,490 |
| 1931 | 5 | — | — | #4,091 |
| 1924 | 6 | — | — | #4,136 |
| 1923 | 5 | — | — | #4,596 |
| 1921 | 6 | — | — | #4,135 |
| 1920 | 6 | — | — | #4,074 |
| 1918 | 13 | — | — | #2,337 |
| 1917 | 7 | — | — | #3,417 |
| 1916 | 7 | — | — | #3,364 |
| 1915 | 5 | — | — | #4,144 |
| 1913 | 6 | — | — | #2,665 |