Cassidy

Cassidy is both a surname of Irish origin and a unisex given name. The surname derives from the Gaelic Ó Caiside, meaning "descendant of Caiside," a medieval Irish learned family. Anglicized spellings include Cassidy and Cassady. As a given name, Cassidy has grown in use in English-speaking countries and is used for people of all genders, often drawn from the surname form.

Notable people with the surname Cassidy include the American actor and singer David Cassidy, famous for The Partridge Family; his son Shaun Cassidy, an actor, musician, and television producer; Cassidy Freeman, an American actress; and Cassidy Rae, an American actress. The stage name Cassidy is also used by the Philadelphia-born rapper Barry Reese.

Notable people with Cassidy as a given name include Cassidy Hubbarth, an American television anchor and sports journalist.

In culture, Cassidy is the title of a Grateful Dead song from the early 1970s. The name also appears in various other works of fiction and media.

There are places named Cassidy in North America and Europe.