The baby name Adelfa appears in baby name data for the United States from 1916 to 1958. It was most popular in 1935 with 30 babies given the name.
In the later years of this period, Adelfa has become less common than it once was.
| Year | Count |
|---|---|
| 1916 | 12 |
| 1919 | 6 |
| 1920 | 8 |
| 1921 | 9 |
| 1922 | 8 |
| 1923 | 9 |
| 1924 | 8 |
| 1926 | 9 |
| 1927 | 18 |
| 1928 | 20 |
| 1929 | 20 |
| 1930 | 10 |
| 1932 | 14 |
| 1933 | 14 |
| 1934 | 8 |
| 1935 | 30 |
| 1936 | 6 |
| 1937 | 8 |
| 1938 | 8 |
| 1939 | 11 |
| 1941 | 6 |
| 1950 | 6 |
| 1951 | 5 |
| 1953 | 6 |
| 1957 | 5 |
| 1958 | 6 |