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Last name Trainor (Trainer , Trainor , טריינור ) , in all the world, is a common cognomen. The cognomen Trainor is characteristic of 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, it is commonest in the United States, the United Kingdom, and Canada. Much less frequently, Trainor is the forename as well as the last name.