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Globally, Obrien (Obrien , Обриен ) is a rare dominantly male, but infrequently girly given name. The first name Obrien is habitual in Ireland, where it is quite a rare gender-neutral name, Jamaica, where it is a rare masculine name, and the Democratic Republic of the Congo. Measured by absolute frequency, it is commonest in the United States, the Democratic Republic of the Congo, and Indonesia. Predominantly, Obrien is the last name as well as the forename.