The baby name Aloysius appears in baby name data for the United States from 1910 to 1970. It was most popular in 1921 with 213 babies given the name.
In the later years of this period, Aloysius has become less common than it once was.
| Year | Count |
|---|---|
| 1910 | 6 |
| 1911 | 22 |
| 1912 | 62 |
| 1913 | 101 |
| 1914 | 143 |
| 1915 | 190 |
| 1916 | 200 |
| 1917 | 190 |
| 1918 | 206 |
| 1919 | 198 |
| 1920 | 208 |
| 1921 | 213 |
| 1922 | 204 |
| 1923 | 151 |
| 1924 | 166 |
| 1925 | 122 |
| 1926 | 103 |
| 1927 | 128 |
| 1928 | 116 |
| 1929 | 88 |
| 1930 | 86 |
| 1931 | 68 |
| 1932 | 60 |
| 1933 | 46 |
| 1934 | 22 |
| 1935 | 23 |
| 1936 | 39 |
| 1937 | 10 |
| 1938 | 47 |
| 1939 | 25 |
| 1940 | 30 |
| 1941 | 15 |
| 1942 | 6 |
| 1943 | 8 |
| 1944 | 8 |
| 1947 | 5 |
| 1948 | 14 |
| 1950 | 14 |
| 1953 | 18 |
| 1955 | 17 |
| 1965 | 5 |
| 1970 | 5 |