Hillis is a rare boys' name that was most common in the 1910s and has all but disappeared.
Hillis is predominantly a boy name. It last appears in U.S. records in 1986. Hillis was first reported in SSA data in 1912 and peaked in 1919 (16 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 1986 | 5 | — | — | #7,130 |
| 1970 | 6 | — | — | #4,452 |
| 1961 | 5 | — | — | #4,314 |
| 1952 | 6 | — | — | #3,525 |
| 1951 | 5 | — | — | #3,936 |
| 1950 | 8 | — | — | #2,882 |
| 1947 | 13 | — | — | #2,197 |
| 1946 | 7 | — | — | #3,019 |
| 1945 | 6 | — | — | #3,143 |
| 1944 | 5 | — | — | #3,637 |
| 1942 | 16 | — | — | #1,831 |
| 1941 | 14 | — | — | #1,947 |
| 1940 | 6 | — | — | #3,274 |
| 1939 | 5 | — | — | #3,706 |
| 1938 | 6 | — | — | #3,327 |
| 1937 | 7 | — | — | #3,030 |
| 1936 | 13 | — | — | #2,003 |
| 1935 | 10 | — | — | #2,449 |
| 1934 | 9 | — | — | #2,645 |
| 1933 | 6 | — | — | #3,447 |
| 1932 | 9 | — | — | #2,729 |
| 1931 | 10 | — | — | #2,556 |
| 1930 | 12 | — | — | #2,363 |
| 1929 | 16 | — | — | #1,961 |
| 1928 | 12 | — | — | #2,449 |
| 1927 | 18 | — | #3,696 | #2,795 |
| 1926 | 15 | — | — | #2,128 |
| 1925 | 15 | — | — | #2,129 |
| 1924 | 11 | — | — | #2,730 |
| 1923 | 16 | — | — | #2,066 |
| 1922 | 9 | — | — | #3,120 |
| 1921 | 15 | — | — | #2,200 |
| 1920 | 13 | — | — | #2,387 |
| 1919 | 16 | — | — | #2,014 |
| 1918 | 19 | — | #5,147 | #2,214 |
| 1917 | 12 | — | — | #2,347 |
| 1916 | 11 | — | — | #2,455 |
| 1915 | 10 | — | — | #2,526 |
| 1914 | 8 | — | — | #2,532 |
| 1913 | 10 | — | — | #1,868 |
| 1912 | 6 | — | — | #2,404 |