Cassidy Name Meaning & Origin
Origin of the name Cassidy:
Transferred use of the surname that is derived from the Irish surname O'Caiside which is of uncertain meaning. One historian believes it is derived from the Gaelic elements cas (a twisted lock of hair; ingenious, clever, sly) and the personal suffix -idhe: hence, "clever one, one with the twisted locks." Or from the Gaelic elements cais (love, esteem) and the plenary suffix -de: hence, "full of love and esteem." Short: Cass. Pet: Cassi, Cassie, Cassy.
From A World of Baby Names by Teresa Norman.
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