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Cognomen Mcdavid (Mcdavid ) , in the entire world, is quite a rare surname. The cognomen Mcdavid is characteristic of Antigua and Barbuda, where it is quite a common surname, Trinidad and Tobago, where it is quite a rare surname, and the United States, where it is a rare surname. Measured by absolute frequency, the name is most common in the United States, Canada, and the United Kingdom. Much less frequently, Mcdavid is the forename as well as the last name.