Cognomen Mustra (Muster 
, Mustra 
) , around the globe, is quite a rare surname. The last name Mustra is habitual in Western Europe, particularly Liechtenstein, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Austria. Measured by absolute frequency, it is the most numerous in Western Europe, particularly Germany, Switzerland, and Austria. Much less frequently, Mustra is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Muster | Germany, Austria, Nigeria, Switzerland, United States |
| Mustra | Australia, Portugal, Indonesia, India, United States |