Lillis is a rare girls' name that was most common in the 1910s and has all but disappeared.
Lillis is a girl name. It last appears in U.S. records in 1963. Lillis was first reported in SSA data in 1880 and peaked in 1919 (25 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1963 | 5 | — | #7,172 |
| 1960 | 5 | — | #6,904 |
| 1958 | 5 | — | #6,602 |
| 1957 | 5 | — | #6,633 |
| 1956 | 6 | — | #5,659 |
| 1955 | 6 | — | #5,550 |
| 1954 | 5 | — | #6,229 |
| 1951 | 6 | — | #5,172 |
| 1950 | 5 | — | #5,744 |
| 1949 | 6 | — | #4,998 |
| 1948 | 5 | — | #5,668 |
| 1947 | 7 | — | #4,577 |
| 1946 | 8 | — | #3,842 |
| 1944 | 8 | — | #3,549 |
| 1943 | 6 | — | #4,468 |
| 1942 | 7 | — | #3,952 |
| 1940 | 7 | — | #3,703 |
| 1939 | 9 | — | #3,038 |
| 1938 | 13 | — | #2,397 |
| 1937 | 8 | — | #3,314 |
| 1936 | 6 | — | #3,957 |
| 1935 | 15 | — | #2,160 |
| 1934 | 12 | — | #2,508 |
| 1933 | 6 | — | #4,008 |
| 1932 | 6 | — | #4,191 |
| 1931 | 12 | — | #2,502 |
| 1930 | 12 | — | #2,622 |
| 1929 | 15 | — | #2,255 |
| 1928 | 15 | — | #2,333 |
| 1927 | 16 | — | #2,304 |
| 1926 | 15 | — | #2,419 |
| 1925 | 20 | — | #1,976 |
| 1924 | 14 | — | #2,610 |
| 1923 | 20 | — | #1,993 |
| 1922 | 20 | — | #1,994 |
| 1921 | 16 | — | #2,335 |
| 1920 | 21 | — | #1,924 |
| 1919 | 25 | — | #1,629 |
| 1918 | 13 | — | #2,598 |
| 1917 | 17 | — | #2,058 |
| 1916 | 19 | — | #1,841 |
| 1915 | 20 | — | #1,711 |
| 1914 | 12 | — | #2,073 |
| 1913 | 12 | — | #1,841 |
| 1911 | 13 | — | #1,338 |
| 1910 | 7 | — | #2,036 |
| 1909 | 6 | — | #2,101 |
| 1908 | 11 | — | #1,313 |
| 1907 | 5 | — | #2,239 |
| 1906 | 5 | — | #2,100 |
| 1904 | 7 | — | #1,578 |
| 1903 | 5 | — | #1,946 |
| 1902 | 8 | — | #1,389 |
| 1899 | 5 | — | #1,737 |
| 1897 | 5 | — | #1,682 |
| 1896 | 8 | — | #1,266 |
| 1895 | 8 | — | #1,253 |
| 1894 | 5 | — | #1,607 |
| 1893 | 6 | — | #1,365 |
| 1891 | 7 | — | #1,156 |
| 1890 | 7 | — | #1,158 |
| 1889 | 9 | — | #932 |
| 1887 | 6 | — | #1,097 |
| 1885 | 7 | — | #882 |
| 1880 | 6 | — | #801 |