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Family name Ybarra (Ibar , Ybarra ) , around the world, is a common cognomen. The last name Ybarra is habitual in Argentina, where it is quite a common surname, Paraguay, where it is quite a rare surname, and Somalia. Not in comparison with a country's population, it is commonest in the United States, Argentina, and Mexico. Much less frequently, Ybarra is the forename as well as the last name.