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Cognomen Looy (洛伊 , 洛依 , Looy ) , all over the world, is quite a rare surname. The cognomen Looy is characteristic of Belgium, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Belarus. Not in comparison with a country's population, this name is the most popular in Belgium, Netherlands, and Ukraine. Very seldom, Looy is the forename as well as the last name.