Family name Mwst (Must 
, Mustum 
, Mwst ) , around the world, is quite a common surname. The cognomen Mwst is characteristic of Estonia, where it is quite a common surname, Norway, where it is quite a rare surname, and Algeria. Measured by absolute frequency, the name is most common in Pakistan, Indonesia, and Estonia. Also, Mwst is the forename as well as the last name.