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Cognomen Ridley (Ridley
, Ридли
, רידלי
) , in the entire world, is a common last name. The cognomen Ridley is characteristic of the United Kingdom, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Australia. Much less frequently, Ridley is the forename as well as the last name.