Firmin is a very rare boys' name that was most common in the 1920s and has all but disappeared.
Firmin is a boy name. It last appears in U.S. records in 1942. Firmin first appears in 1913 and peaked in 1928 (13 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1942 | 5 | — | #3,751 |
| 1938 | 5 | — | #3,705 |
| 1934 | 6 | — | #3,421 |
| 1932 | 5 | — | #3,957 |
| 1928 | 13 | — | #2,310 |
| 1927 | 11 | — | #2,587 |
| 1926 | 7 | — | #3,509 |
| 1925 | 5 | — | #4,449 |
| 1924 | 8 | — | #3,341 |
| 1923 | 5 | — | #4,455 |
| 1919 | 6 | — | #3,883 |
| 1918 | 9 | — | #2,958 |
| 1915 | 5 | — | #4,027 |
| 1913 | 7 | — | #2,350 |