Illya is a rare boys' name that peaked in 1966 and has since faded.
Illya is predominantly a boy name. It last appears in U.S. records in 2024. Illya first appears in 1965 and peaked in 1966 (78 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2024 | 13 | 13 | #11,499 | #13,019 |
| 2020 | 5 | 5 | — | #12,805 |
| 2014 | 5 | 5 | — | #12,793 |
| 2010 | 6 | 6 | — | #11,262 |
| 2009 | 7 | 7 | — | #10,256 |
| 2007 | 6 | 6 | — | #11,449 |
| 1995 | 6 | — | — | #8,196 |
| 1994 | 6 | — | — | #8,156 |
| 1990 | 5 | — | — | #8,641 |
| 1989 | 6 | — | — | #7,351 |
| 1988 | 5 | — | — | #7,738 |
| 1984 | 5 | — | — | #6,726 |
| 1979 | 5 | — | — | #6,443 |
| 1976 | 9 | — | — | #3,842 |
| 1975 | 6 | — | — | #5,058 |
| 1974 | 6 | — | — | #4,872 |
| 1973 | 14 | — | — | #2,645 |
| 1972 | 18 | — | — | #2,195 |
| 1971 | 9 | — | — | #3,487 |
| 1970 | 18 | — | — | #2,163 |
| 1969 | 26 | — | — | #1,622 |
| 1968 | 23 | — | #7,421 | #1,920 |
| 1967 | 66 | — | #4,411 | #975 |
| 1966 | 89 | — | #4,046 | #829 |
| 1965 | 40 | — | #6,896 | #1,304 |