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Last name Oshea (Oshea ) , all around the world, is a common family name. The family name Oshea is habitual in Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Ireland. Very seldom, Oshea is the forename as well as the last name.