Lenis is a very rare name used for both girls and boys that was most common in the 1930s and has all but disappeared.
Lenis is predominantly a boy name. It last appears in U.S. records in 2004. Lenis first appears in 1917 and peaked in 1922 (9 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2004 | 9 | 9 | #11,234 | — |
| 2001 | 5 | 5 | #16,830 | — |
| 1972 | 6 | — | — | #4,752 |
| 1957 | 5 | — | — | #4,309 |
| 1956 | 6 | — | — | #3,762 |
| 1954 | 8 | — | — | #3,079 |
| 1951 | 6 | — | — | #3,572 |
| 1950 | 7 | — | — | #3,199 |
| 1948 | 6 | — | — | #3,518 |
| 1947 | 9 | — | — | #2,781 |
| 1945 | 8 | — | — | #2,667 |
| 1944 | 5 | — | — | #3,709 |
| 1942 | 9 | — | — | #2,623 |
| 1939 | 7 | — | — | #3,000 |
| 1938 | 5 | — | #4,687 | — |
| 1937 | 11 | — | #4,617 | #3,360 |
| 1936 | 10 | — | #4,565 | #3,843 |
| 1935 | 6 | — | — | #3,472 |
| 1934 | 16 | — | #3,649 | #2,671 |
| 1933 | 6 | — | #3,994 | — |
| 1932 | 6 | — | — | #3,598 |
| 1931 | 5 | — | — | #4,090 |
| 1929 | 14 | — | #3,550 | #3,775 |
| 1928 | 5 | — | #5,101 | — |
| 1925 | 6 | — | — | #3,987 |
| 1923 | 6 | — | — | #4,060 |
| 1922 | 9 | — | — | #3,143 |
| 1921 | 5 | — | — | #4,692 |
| 1920 | 7 | — | — | #3,674 |
| 1919 | 5 | — | — | #4,521 |
| 1917 | 7 | — | — | #3,416 |