>
Last name O Brien (O Brien
) , globally, is quite a common family name. The cognomen O Brien is characteristic of Ireland, where it is quite a common surname, Australia, where it is a rare surname, and the United States. Not in comparison with a country's population, the name is most common in Ireland, the United States, and the United Kingdom.
VARIANT | COUNTRY |
---|---|
O Brien | Australia, Ireland, United Kingdom, United States, Indonesia |