Alphonsus is a rare boys' name that peaked in 1917 and has grown less common since.
Alphonsus is a boy name. In 2025 it ranked #9,767 for boy births in the United States (and #20,157 across all names), given to 7 babies. Alphonsus first appears in 1883 and peaked in 1917 (28 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 7 | 7 | #9,767 |
| 2024 | 9 | 9 | #8,344 |
| 2023 | 10 | 10 | #7,773 |
| 2022 | 8 | 8 | #9,026 |
| 2020 | 6 | 6 | #10,666 |
| 2019 | 6 | 6 | #10,873 |
| 1978 | 5 | — | #5,806 |
| 1975 | 5 | — | #5,485 |
| 1965 | 9 | — | #2,783 |
| 1962 | 7 | — | #3,309 |
| 1959 | 5 | — | #4,006 |
| 1957 | 5 | — | #4,003 |
| 1950 | 6 | — | #3,331 |
| 1945 | 5 | — | #3,345 |
| 1942 | 9 | — | #2,527 |
| 1941 | 9 | — | #2,495 |
| 1940 | 6 | — | #3,141 |
| 1939 | 5 | — | #3,488 |
| 1937 | 5 | — | #3,534 |
| 1936 | 9 | — | #2,454 |
| 1935 | 6 | — | #3,265 |
| 1932 | 7 | — | #3,096 |
| 1931 | 7 | — | #3,102 |
| 1930 | 6 | — | #3,603 |
| 1929 | 13 | — | #2,203 |
| 1928 | 15 | — | #2,049 |
| 1926 | 9 | — | #2,910 |
| 1925 | 14 | — | #2,195 |
| 1924 | 20 | — | #1,779 |
| 1923 | 13 | — | #2,333 |
| 1922 | 22 | — | #1,648 |
| 1921 | 10 | — | #2,807 |
| 1920 | 20 | — | #1,750 |
| 1919 | 10 | — | #2,673 |
| 1918 | 8 | — | #3,103 |
| 1917 | 28 | — | #1,291 |
| 1916 | 10 | — | #2,548 |
| 1915 | 11 | — | #2,313 |
| 1914 | 13 | — | #1,779 |
| 1913 | 8 | — | #2,096 |
| 1911 | 5 | — | #1,747 |
| 1901 | 6 | — | #948 |
| 1900 | 5 | — | #1,317 |
| 1898 | 8 | — | #804 |
| 1895 | 8 | — | #799 |
| 1892 | 9 | — | #750 |
| 1890 | 5 | — | #1,002 |
| 1889 | 5 | — | #975 |
| 1887 | 6 | — | #822 |
| 1884 | 6 | — | #852 |
| 1883 | 5 | — | #895 |