Illona is a very rare variant of Iliana that was most common in the 1940s and has all but disappeared.
Illona is a girl name. It last appears in U.S. records in 1972. Illona was first reported in SSA data in 1940 and peaked in 1946 (23 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1972 | 5 | — | #8,740 |
| 1970 | 5 | — | #8,455 |
| 1966 | 6 | — | #6,069 |
| 1964 | 5 | — | #7,158 |
| 1960 | 5 | — | #6,723 |
| 1959 | 8 | — | #4,779 |
| 1956 | 8 | — | #4,608 |
| 1955 | 6 | — | #5,455 |
| 1954 | 13 | — | #3,216 |
| 1953 | 16 | — | #2,736 |
| 1952 | 14 | — | #2,972 |
| 1951 | 17 | — | #2,521 |
| 1950 | 14 | — | #2,823 |
| 1949 | 14 | — | #2,780 |
| 1948 | 12 | — | #3,047 |
| 1947 | 20 | — | #2,233 |
| 1946 | 23 | — | #1,935 |
| 1945 | 11 | — | #2,811 |
| 1944 | 11 | — | #2,839 |
| 1943 | 20 | — | #1,966 |
| 1942 | 13 | — | #2,588 |
| 1940 | 5 | — | #4,640 |