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Last name Siaosi (George , Siaosi ) , globally, is a widespread surname. The cognomen Siaosi is characteristic of Latin America and the Caribbean, particularly Dominica, where it is a widespread surname, Grenada, and Saint Lucia (explore the name in all countries). Not in comparison with a country's population, the name is most common in India, the United States, and Nigeria. More prevalently, Siaosi is the forename as well as the last name.