Casy is a very rare variant of Casey that was most common in the 1980s and has all but disappeared.
Casy is predominantly a boy name. It last appears in U.S. records in 2000. Casy first appears in 1976 and peaked in 1985 (13 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2000 | 5 | 5 | #15,473 | — |
| 1999 | 11 | 11 | #12,968 | #10,139 |
| 1998 | 12 | 12 | #14,534 | #7,685 |
| 1997 | 6 | — | #12,351 | — |
| 1995 | 11 | — | — | #5,178 |
| 1994 | 6 | — | — | #7,921 |
| 1993 | 6 | — | — | #7,768 |
| 1992 | 7 | — | — | #6,765 |
| 1990 | 13 | — | #10,382 | #7,306 |
| 1988 | 20 | — | #7,793 | #4,197 |
| 1987 | 12 | — | #8,916 | #7,106 |
| 1986 | 15 | — | #8,662 | #4,916 |
| 1985 | 18 | — | #10,907 | #3,437 |
| 1984 | 13 | — | #10,646 | #4,619 |
| 1983 | 9 | — | #6,785 | — |
| 1982 | 17 | — | #6,427 | #5,097 |
| 1981 | 6 | — | — | #5,604 |
| 1980 | 6 | — | — | #5,622 |
| 1979 | 5 | — | — | #6,183 |
| 1978 | 5 | — | #9,951 | — |
| 1976 | 5 | — | — | #5,725 |