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I do not know which Kennedy you are asking about-- there are many people with the name "Kennedy." However, a "psycho" usually refers to a crazed person or a killer (a psychopath). I am not sure any of the Kennedys that I know about fit that description.
Mimi Kennedy's birth name is Mary Claire Kennedy.
Lee
In the US, "The Kennedys" are generally considered to be the people who are descended from Joseph Kennedy and his wife, Rose. These include John F. Kennedy, Robert Kennedy and their children, etc. There are many people who have the Kennedy surname who are not members of "The Kennedys."
Lisa Kennedy Montgomery's birth name is Lisa Kennedy Montgomery.
Dee Kennedy's birth name is Deirdre Kennedy.
Dusty Kennedy's birth name is Robert Kennedy.
Shae Kennedy's birth name is Shannon Kennedy.
Yes, Kennedy is a popular name.
Patrick Henry, Kennedy dempesey
Jacqueline Bouvier married John F. Kennedy. Many years after his death, she married Aristotle Onassis.
The name Kennedy is from the Gaelic name Cinnéidighmeaning "armoured head" or "misshapen head", but most people associate it with the American political dynasty.