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Surname Sihu (四虎 , Sihu , 思虎 ) , in all the world, is quite a rare cognomen. The cognomen Sihu is habitual in South Africa, where it is a rare surname, China, where it is a very rare surname, and India. Measured by absolute frequency, this name is the most popular in China, India, and Indonesia. More prevalently, Sihu is the forename as well as the last name.