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Family name Murdock (Murdock , מרדוק , مردوخ ) , all over the world, is a common surname. The family name Murdock is characteristic of Jamaica, where it is quite a common surname, Ireland, and the United States, where it is quite a rare surname. In absolute terms, it is commonest in the United States, Canada, and the United Kingdom. Very seldom, Murdock is the forename as well as the last name.