The baby name Lennis appears in baby name data for the United States from 1920 to 1963. It was most popular in 1955 with 20 babies given the name.
In the later years of this period, Lennis has become more popular compared with earlier years.
| Year | Count |
|---|---|
| 1920 | 6 |
| 1921 | 6 |
| 1922 | 5 |
| 1927 | 5 |
| 1929 | 6 |
| 1930 | 5 |
| 1938 | 5 |
| 1939 | 5 |
| 1947 | 7 |
| 1951 | 5 |
| 1953 | 5 |
| 1955 | 20 |
| 1956 | 10 |
| 1962 | 5 |
| 1963 | 5 |