according to one site, that name is one of the rarer types in Germany and obviously more common in Austria. According to one site roughly 4.000 folks carry that name worldwide, another site gives 11.000 entries. The meaning of the name "Mauser" is a guy who is hunting down mice. A micecatcher - maeusefänger, same as a ratcatcher - rattenfaenger.
https://forebears.io/de/surnames/mauser and https://de.geneanet.org/genealogie/mauser/MAUSER
A variant of the name is "Mausser", with double "S". According to this site (https://de.geneanet.org/genealogie/mausser/MAUSSER) that name is even less frequent (1.600 entries) and present at several towns in Baden-Württemberg ending with -INGEN (that hints to alemannic tribe origin - https://en.wikipedia.org/wiki/Alemanni).