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Cognomen Mouser (モーサ , Mouser , Маусер ) , worldwide, is quite a rare last name. The last name Mouser is habitual in Mauritius, where it is quite a rare surname, the United States, where it is a rare surname, and New Zealand. In absolute terms, the name is most common in the United States, the United Kingdom, and Australia. Much less frequently, Mouser is the forename as well as the last name.