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Last name Dewar (Dewar , Дьюар , 杜瓦) , around the globe, is a common family name. The family name Dewar is characteristic of Jamaica, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in the United Kingdom, the United States, and Canada. Much less frequently, Dewar is the forename as well as the last name.