The Gaelic family name O’ Caiside is derived from the word cas, a nickname for someone with curly name. O’Caiside became O’ Cassidy, an Irish clan was well-known for their intellectual prowess. Cassidy has since become a popular girl’s name and a light, bouncy alternative to Cassandra.
Rank in the year 2015
Cassidy was ranked #549 in the most popular American names of 2015.
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