Surname Maddax (Maddax 
) , across the world, is a very rare family name. The family name Maddax is habitual in New Zealand, where it is a very rare surname, the United Kingdom, and the United States, where it is an extremely rare surname. Much less frequently, Maddax is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Maddax | Philippines, New Zealand, United States, United Kingdom |