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Surname 世良 (世良 , Shiliang , Сэра ) , in all the world, is quite a rare last name. The cognomen 世良 is characteristic of China, where it is a rare surname, Singapore, where it is a very rare surname, and Malaysia. Measured by absolute frequency, it is commonest in China, Indonesia, and Malaysia. More frequently, 世良 is the forename as well as the last name.