Cassey is a unisex given name of American origin, derived from Cassandra, a figure from Greek mythology who was cursed to foresee future events but never believed. The name Cassey has gained popularity in recent decades, with its usage peaking in the late 1980s and early 1990s. It is often seen as a diminutive of Cassandra or a more modern variant of Casey. Spelling variations include Cassy, Kacey, and Kasie. The name Cassey has been used for both males and females, but it is more commonly associated with femininity in recent years. As of 2021, the Social Security Administration ranks Cassey as the 785th most popular female name and the 963rd most popular male name in the United States.
The name Cassey experienced significant popularity from the late 1960s to the early 1980s, with a peak of 88 births in 1982. However, its usage has declined steadily since then, dropping to single digits by the mid-1990s and remaining relatively low ever since, with only 7 births recorded in 2021. Overall, Cassey was given to a total of 1691 babies between 1968 and 2021.