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Cognomen 忍 (忍 , Shinobu , Shinobi ) , in the world, is a common family name. The surname 忍 is characteristic of Eastern Asia, particularly Japan, where it is quite a rare surname, China, where it is a rare surname, and Taiwan. Measured by absolute frequency, it is commonest in China, Japan, and Indonesia. Also, 忍 is the forename as well as the last name.