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Transferred use of the Anglicized form of the Irish surname Ó Caiside. Its use as a girl's name may be due to the -y ending, coupled with the fact that it could be taken as an expanded form of Cass (a medieval and modern short form of Cassandra).
1,982nd in the U.S.

Nicknames & variations

Quick facts

Thousands
of people in the U.S have this name
14,275
to be exact
46,911
if you include dead people (since the government started keeping track)
Utah
has the most people named Cassidy per capita
1999
marked the height of its popularity
98%
2%
0%
55+
1%
30-54
17%
13-29
82%
0-12

Top state populations

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