From an Irish surname, an Anglicized form of Irish Gaelic
Ó Cinnéidigh, itself derived from the given name
Cennétig. The name has sometimes been given in honour of assassinated American president John F. Kennedy (1917-1963). It was popularized as a name for girls by Lisa Kennedy Montgomery (1972-), known simply as Kennedy, the host of the television program
Alternative Nation on MTV from 1992 to 1997.