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Surname Sherlock (Sherlock , シャーロック , شيرلوك) , all over the world, is a common family name. The last name Sherlock is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Very seldom, Sherlock is the forename as well as the last name.