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Cassidy is a given name derived from an Irish surname and ultimately from the Gaelic given name Caiside, meaning “clever” or “curly-haired.” The name Caisidecomes from the Gaelic word element cas, according to “Behindthename.com”[1][2]
Cassidy was the 244th most popular name for girls born in the United States in 2009. It was most popular in 1999, when it was the 99th most popular name for American girls. It first appeared among the 1,000 most popular names for American girls in 1981. Kassidy, an alternate spelling, was ranked as the 443rd most popular name for girls in 2009.[3] Cassidy last appeared among the top 1,000 names for American boys in 1992. It was among the top 1,000 names for American boys between 1983 and 1992; its highest ranking was 666th most popular name for boys born in 1984.[3]
The name Cassidy was a known last name.
Cassidy may have become a first name due to baby-boomer parents naming their children after ’70s teen idol David Cassidy or the Grateful Dead song, “Cassidy”