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Cognomen Sanday (Sanday , 桑迪 ) , around the globe, is quite a rare last name. The last name Sanday is habitual in Fiji, where it is quite a common surname, Philippines, where it is quite a rare surname, and Kuwait. Measured by absolute frequency, it is commonest in Philippines, India, and Saudi Arabia. Likewise, Sanday is the forename as well as the last name.