Jillyn is a very rare variant of Jillian that was most common in the 1970s and has all but disappeared.
Jillyn is a girl name. It last appears in U.S. records in 2002. Jillyn was first reported in SSA data in 1950 and peaked in 1976 (10 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2002 | 5 | 5 | #16,628 |
| 1996 | 5 | — | #14,488 |
| 1992 | 6 | — | #12,425 |
| 1989 | 5 | — | #13,261 |
| 1988 | 8 | — | #8,733 |
| 1987 | 6 | — | #10,423 |
| 1985 | 6 | — | #9,827 |
| 1983 | 10 | — | #6,409 |
| 1981 | 6 | — | #9,580 |
| 1980 | 6 | — | #9,574 |
| 1979 | 5 | — | #10,863 |
| 1978 | 8 | — | #7,234 |
| 1976 | 10 | — | #5,763 |
| 1975 | 5 | — | #9,652 |
| 1974 | 6 | — | #8,101 |
| 1973 | 7 | — | #6,957 |
| 1971 | 8 | — | #6,249 |
| 1970 | 8 | — | #6,024 |
| 1969 | 8 | — | #5,656 |
| 1968 | 5 | — | #7,476 |
| 1967 | 5 | — | #7,221 |
| 1966 | 5 | — | #6,997 |
| 1965 | 6 | — | #6,102 |
| 1963 | 5 | — | #7,035 |
| 1961 | 7 | — | #5,533 |
| 1951 | 5 | — | #5,771 |
| 1950 | 5 | — | #5,640 |