Cognomen Mielz (Mux 
, Mielz 
) , around the world, is quite a rare family name. The cognomen Mielz is habitual in Guatemala, where it is quite a common surname, Bosnia and Herzegovina, where it is quite a rare surname, and Argentina, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mux | Bosnia and Herzegovina, Guatemala, Indonesia, Argentina, Germany |
| Mielz | United States |