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Last name Sial (Si , Sial , سیال ) , across the world, is a widespread surname. The family name Sial is habitual in Macao, where it is a common surname, Myanmar, and Malaysia, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, the name is most common in China, India, and Myanmar. Also, Sial is the forename as well as the last name.