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Last name Sizer (Sizer , 赛泽 ) , worldwide, is quite a rare cognomen. The family name Sizer is habitual in the United Kingdom, where it is quite a rare surname, Australia, and Bangladesh, where it is a rare surname. Measured by absolute frequency, it is the most numerous in the United States, Bangladesh, and the United Kingdom. Very seldom, Sizer is the forename as well as the last name.