In the world, O'Brian (O'Brian 
, オブライエン 
, О'Брайан 
) is a rare masculine first name. The first name O'Brian is characteristic of Jamaica, where it is quite a rare boy's name, the Democratic Republic of the Congo, where it is a rare masculine name, and South Africa, where it is a very rare masculine name. Likewise, O'Brian is the last name as well as the forename.
O'Brian is also a name for the fictitious and mythical characters: .