The baby name Lennie appears in baby name data for the United States from 1910 to 2024. It was most popular in 1915 with 156 babies given the name.
In the later years of this period, Lennie has become less common than it once was.
| Year | Count |
|---|---|
| 1910 | 38 |
| 1911 | 51 |
| 1912 | 90 |
| 1913 | 61 |
| 1914 | 92 |
| 1915 | 156 |
| 1916 | 122 |
| 1917 | 97 |
| 1918 | 59 |
| 1919 | 75 |
| 1920 | 51 |
| 1921 | 99 |
| 1921 | 10 |
| 1922 | 33 |
| 1922 | 12 |
| 1923 | 21 |
| 1924 | 78 |
| 1924 | 5 |
| 1925 | 69 |
| 1926 | 56 |
| 1927 | 60 |
| 1928 | 57 |
| 1929 | 54 |
| 1930 | 55 |
| 1931 | 49 |
| 1932 | 52 |
| 1933 | 49 |
| 1933 | 18 |
| 1934 | 17 |
| 1934 | 15 |
| 1935 | 26 |
| 1936 | 32 |
| 1937 | 16 |
| 1938 | 10 |
| 1939 | 11 |
| 1940 | 18 |
| 1941 | 22 |
| 1943 | 6 |
| 1944 | 5 |
| 1945 | 16 |
| 1945 | 18 |
| 1946 | 25 |
| 1948 | 12 |
| 1948 | 27 |
| 1949 | 16 |
| 1950 | 10 |
| 1951 | 7 |
| 1951 | 6 |
| 1954 | 16 |
| 1955 | 18 |
| 1956 | 15 |
| 1957 | 34 |
| 1958 | 43 |
| 1959 | 15 |
| 1960 | 17 |
| 1961 | 10 |
| 1962 | 16 |
| 1963 | 5 |
| 1964 | 10 |
| 1965 | 10 |
| 1969 | 5 |
| 1973 | 5 |
| 1974 | 6 |
| 1976 | 5 |
| 1980 | 6 |
| 2023 | 24 |
| 2024 | 5 |