Gustavus is a very rare boys' name that was most common in the 1960s and has all but disappeared.
Gustavus is a boy name. It last appears in U.S. records in 2006. Gustavus was first reported in SSA data in 1880 and peaked in 1966 (10 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2006 | 5 | 5 | #12,705 |
| 2001 | 5 | 5 | #11,176 |
| 1989 | 6 | — | #7,323 |
| 1988 | 5 | — | #7,698 |
| 1980 | 7 | — | #5,143 |
| 1974 | 7 | — | #4,333 |
| 1973 | 10 | — | #3,299 |
| 1972 | 8 | — | #3,763 |
| 1970 | 9 | — | #3,370 |
| 1969 | 7 | — | #3,728 |
| 1968 | 8 | — | #3,208 |
| 1967 | 8 | — | #3,085 |
| 1966 | 10 | — | #2,692 |
| 1964 | 7 | — | #3,406 |
| 1963 | 6 | — | #3,791 |
| 1961 | 5 | — | #4,299 |
| 1960 | 5 | — | #4,267 |
| 1959 | 5 | — | #4,226 |
| 1958 | 7 | — | #3,382 |
| 1956 | 6 | — | #3,694 |
| 1955 | 6 | — | #3,660 |
| 1950 | 6 | — | #3,466 |
| 1947 | 6 | — | #3,507 |
| 1940 | 6 | — | #3,261 |
| 1938 | 5 | — | #3,734 |
| 1930 | 7 | — | #3,419 |
| 1927 | 8 | — | #3,271 |
| 1923 | 5 | — | #4,497 |
| 1922 | 7 | — | #3,666 |
| 1918 | 9 | — | #2,968 |
| 1917 | 8 | — | #3,046 |
| 1915 | 9 | — | #2,709 |
| 1914 | 7 | — | #2,763 |
| 1913 | 7 | — | #2,360 |
| 1911 | 6 | — | #1,623 |
| 1890 | 5 | — | #1,065 |
| 1884 | 5 | — | #1,042 |
| 1882 | 8 | — | #725 |
| 1881 | 5 | — | #928 |
| 1880 | 5 | — | #968 |