Total babies named Illona (all years): 251
| Year | Girls (count / rank / %) |
|---|---|
| 1972 | 5 / #8740 / 0.000% |
| 1970 | 5 / #8456 / 0.000% |
| 1966 | 6 / #6068 / 0.000% |
| 1964 | 5 / #7158 / 0.000% |
| 1960 | 5 / #6722 / 0.000% |
| 1959 | 8 / #4779 / 0.000% |
| 1956 | 8 / #4608 / 0.000% |
| 1955 | 6 / #5455 / 0.000% |
| 1954 | 13 / #3216 / 0.001% |
| 1953 | 16 / #2735 / 0.001% |
| Year | Girls (count / rank / %) |
|---|---|
| 1952 | 14 / #2972 / 0.001% |
| 1951 | 17 / #2521 / 0.001% |
| 1950 | 14 / #2823 / 0.001% |
| 1949 | 14 / #2780 / 0.001% |
| 1948 | 12 / #3047 / 0.001% |
| 1947 | 20 / #2233 / 0.001% |
| 1946 | 23 / #1935 / 0.001% |
| 1945 | 11 / #2811 / 0.001% |
| 1944 | 11 / #2839 / 0.001% |
| 1943 | 20 / #1966 / 0.001% |
| Year | Girls (count / rank / %) |
|---|---|
| 1942 | 13 / #2588 / 0.001% |
| 1940 | 5 / #4640 / 0.000% |