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Cognomen Lowther (وثر , Lowther , Лаутер ) , around the globe, is quite a common surname. The last name Lowther is habitual in Ireland, where it is quite a rare surname, Jamaica, and the United Kingdom. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Canada. Very seldom, Lowther is the forename as well as the last name.