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Surname O' (Ó , O' , О' ) , in the world, is quite a rare family name. The surname O' is characteristic of Portugal, where it is quite a rare surname, Ireland, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, this name is the most popular in China, the United Kingdom, and Portugal. Also, O' is the forename as well as the last name.