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Last name Rainey (Rainey , ريني , レイニー ) , all over the world, is a common surname. The surname Rainey is characteristic of British Virgin Islands, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United States. Not in comparison with a country's population, it most frequently occurs in the United States, the United Kingdom, and Canada. Very seldom, Rainey is the forename as well as the last name.