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Family name Ruach (Ruach , רוח ) , throughout the world, is a rare cognomen. The last name Ruach is habitual in Israel, where it is quite a rare surname, Sudan, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Israel, Sudan, and the United States. Much less frequently, Ruach is the forename as well as the last name.