An Irish surname meaning 'descendant of Caiside', also used as a given name. It's associated with various notable figures including the outlaw Butch Cassidy.
From Irish Gaelic 'Ó Caiside', meaning 'descendant of Caiside'. The personal name Caiside may derive from 'cas' meaning 'curly-haired' or 'twisted'. The name spread through Irish immigration, particularly to America.
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