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Last name Siy (Sella , Silla , Siy ) , worldwide, is a common surname. The cognomen Siy is habitual in Guam, where it is quite a common surname, Gambia, and Guinea-Bissau (explore the name in all countries). In absolute terms, it is the most numerous in India, Indonesia, and Italy. Likewise, Siy is the forename as well as the last name.