Total babies named Jef (all years): 129
| Year | Boys (count / rank / %) |
|---|---|
| 1973 | 6 / #4771 / 0.000% |
| 1972 | 7 / #4183 / 0.000% |
| 1971 | 9 / #3496 / 0.001% |
| 1970 | 5 / #5056 / 0.000% |
| 1969 | 6 / #4151 / 0.000% |
| 1966 | 8 / #3105 / 0.000% |
| 1965 | 8 / #3102 / 0.000% |
| 1964 | 7 / #3435 / 0.000% |
| 1963 | 15 / #2157 / 0.001% |
| 1962 | 7 / #3455 / 0.000% |
| Year | Boys (count / rank / %) |
|---|---|
| 1961 | 8 / #3216 / 0.000% |
| 1960 | 12 / #2474 / 0.001% |
| 1959 | 7 / #3420 / 0.000% |
| 1958 | 5 / #4213 / 0.000% |
| 1957 | 5 / #4254 / 0.000% |
| 1956 | 9 / #2871 / 0.000% |
| 1953 | 5 / #4066 / 0.000% |