The name Maddox is a girl's name meaning "son of Madoc".

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The possibility of the nickname Maddy (or the even spunkier Moxie) makes this have some potential as a modern, unisex name for a girl - if you can get past the strongly masculine meaning. 

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Maddox

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The name Maddox is a boy's name of Welsh origin meaning "son of Madoc".

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Maddox, a previously obscure Welsh family name with a powerfully masculine image, suddenly came into the spotlight when Angelina Jolie chose it for her son in 2003. By the following year it was in the middle of the Top 1000, and it has risen since.
 It was Maddox who set the precedent for all the boys in the Jolie-Pitt clan to have names ending in 'x'-and helped fuel the spark for all names X. 
 Maddox is related to the traditional Welsh Madoc (pronounced MAH-dog), meaning 'fortunate'; it belonged to a bearer who, according to legend, colonized North America in the twelfth century.
 Maddox is a character in The Vampire Diaries; spelled Madox, it appeared in Michael Ondaatje's The English Patient.

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