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Family name Okihara (Okihara ) , throughout the world, is a rare last name. The cognomen Okihara is characteristic of Hong Kong, where it is a rare surname, the United States, where it is a very rare surname, and Philippines, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in the United States, Hong Kong, and Brazil. Very seldom, Okihara is the forename as well as the last name.