Lillias is a very rare girls' name that was most common in the 1910s and has all but disappeared.
Lillias is a girl name. It last appears in U.S. records in 1938. Lillias was first reported in SSA data in 1892 and peaked in 1918 (12 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1938 | 5 | — | #4,693 |
| 1934 | 6 | — | #4,090 |
| 1933 | 6 | — | #4,007 |
| 1932 | 8 | — | #3,448 |
| 1931 | 6 | — | #4,140 |
| 1929 | 5 | — | #4,975 |
| 1928 | 9 | — | #3,333 |
| 1927 | 5 | — | #5,256 |
| 1926 | 7 | — | #4,101 |
| 1925 | 5 | — | #5,436 |
| 1924 | 7 | — | #4,249 |
| 1923 | 7 | — | #4,193 |
| 1922 | 6 | — | #4,764 |
| 1921 | 10 | — | #3,289 |
| 1920 | 11 | — | #3,008 |
| 1919 | 9 | — | #3,347 |
| 1918 | 12 | — | #2,758 |
| 1917 | 5 | — | #4,980 |
| 1916 | 11 | — | #2,747 |
| 1915 | 10 | — | #2,815 |
| 1914 | 8 | — | #2,768 |
| 1913 | 9 | — | #2,248 |
| 1911 | 6 | — | #2,345 |
| 1909 | 6 | — | #2,100 |
| 1900 | 5 | — | #2,089 |
| 1897 | 5 | — | #1,681 |
| 1892 | 5 | — | #1,565 |