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Last name О'Коннор (O'Connor , О'Коннор , O'Konnor) , around the world, is a common cognomen. The family name О'Коннор is characteristic of Ireland, where it is a common surname, Jersey, and Australia, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, the name is most common in the United States, Ireland, and Australia.