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Meaning and Origin of: Cassidy

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First name origins & meanings:

  • Irish : Curly headed; clever
  • Celtic, Gaelic : Clever

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Last name origin & meaning:

  • Irish (Fermanagh) : reduced Anglicized form of Gaelic Ó Caiside ‘descendant of Caiside’, a byname from cas ‘curly(-headed)’.

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