Maddox began as a Welsh surname meaning 'son of Madog' and is now used as a first name. Madog, also spelled Madoc, is an old given name, probably from the Welsh word mad, meaning 'good' or 'fortunate'. Maddox is pronounced MAD-uhks (/ˈmædəks/), with the stress on the first syllable.
The name drew wide attention in 2002, when the actress Angelina Jolie adopted her first child from Cambodia and named him Maddox. In the U.S., it had been rare until then, with just 25 boys given the name in 2001. It rose quickly after that and reached its peak in 2017, ranking 136th. It has since eased, placing 209th in 2025, when 1,664 boys received the name.