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Last name Collett (Collett , كوليت , Коллетт ) , all over the world, is a common surname. The last name Collett is habitual in Isle of Man, where it is quite a common surname, New Zealand, where it is quite a rare surname, and the United Kingdom. In absolute terms, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, Collett is the forename as well as the last name.