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Last name Trainer (Trainer , Trainor , トレーナー ) , throughout the world, is a common family name. The family name Trainer is habitual in Northern Europe, particularly Jersey, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United Kingdom. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Canada. Very seldom, Trainer is the forename as well as the last name.