usually a last name, famous referrence: Elizabeth Cady Santon who wrote a declaration of women's rights 

Cady was originally an English surname, coming from the Old English personal name Cada, meaning "lump; swelling." In the 20th century, Cady is often used as an alternate spelling of Katie, influenced by the American suffragette Elizabeth Cady Stanton (1815-1902)
See Also: Cadi, Katie, Kady

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