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Family name Banham (Banham , بنهام , בנהם ) , worldwide, is quite a rare surname. The surname Banham is characteristic of the United Kingdom, where it is quite a rare surname, Australia, and New Zealand, where it is a rare surname. Measured by absolute frequency, the name is most common in the United Kingdom, Australia, and the United States. Much less frequently, Banham is the forename as well as the last name.