Total babies named Spero (all years): 316
| Year | Boys (count / rank / %) |
|---|---|
| 1971 | 6 / #4844 / 0.000% |
| 1970 | 6 / #4656 / 0.000% |
| 1969 | 6 / #4345 / 0.000% |
| 1968 | 5 / #4662 / 0.000% |
| 1966 | 7 / #3499 / 0.000% |
| 1965 | 6 / #3875 / 0.000% |
| 1964 | 7 / #3564 / 0.000% |
| 1963 | 6 / #3993 / 0.000% |
| 1962 | 5 / #4549 / 0.000% |
| 1961 | 6 / #4011 / 0.000% |
| Year | Boys (count / rank / %) |
|---|---|
| 1959 | 7 / #3575 / 0.000% |
| 1958 | 7 / #3525 / 0.000% |
| 1957 | 6 / #3940 / 0.000% |
| 1955 | 10 / #2735 / 0.000% |
| 1953 | 6 / #3752 / 0.000% |
| 1952 | 9 / #2851 / 0.000% |
| 1951 | 9 / #2828 / 0.000% |
| 1950 | 12 / #2307 / 0.001% |
| 1947 | 8 / #3067 / 0.000% |
| 1946 | 8 / #2891 / 0.000% |
| Year | Boys (count / rank / %) |
|---|---|
| 1942 | 6 / #3522 / 0.000% |
| 1940 | 6 / #3423 / 0.001% |
| 1933 | 11 / #2354 / 0.001% |
| 1932 | 14 / #2087 / 0.001% |
| 1931 | 10 / #2629 / 0.001% |
| 1930 | 9 / #2990 / 0.001% |
| 1928 | 9 / #3052 / 0.001% |
| 1927 | 5 / #4718 / 0.000% |
| 1926 | 10 / #2884 / 0.001% |
| 1925 | 7 / #3697 / 0.001% |
| Year | Boys (count / rank / %) |
|---|---|
| 1924 | 12 / #2614 / 0.001% |
| 1923 | 13 / #2429 / 0.001% |
| 1922 | 10 / #2978 / 0.001% |
| 1921 | 6 / #4265 / 0.001% |
| 1920 | 8 / #3461 / 0.001% |
| 1919 | 11 / #2644 / 0.001% |
| 1918 | 8 / #3334 / 0.001% |
| 1917 | 9 / #2924 / 0.001% |
| 1916 | 5 / #4441 / 0.001% |
| 1915 | 5 / #4319 / 0.001% |