The name Mouser appears with a number of spelling variations dependent on the literacy and dialect of the person. There are approximately 300 Mowser/Mouser's in the UK. Origonally located on the Suffolk /Norfolk borders easily traceable back to the 1600's. There are also Mowsers in Canada, South Africa/Rhodesia, HongKong and The West Indies all with known links to the UK. Any link between the UK and Germany is not known but with such an unusual name most likely. There is a record of Jo Mowser emigrating to Virginia in 1635. It is possible that the Australia link is with the UK rather than the USA.It is most unlikely that there is a family crest etc.