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Family name Prospere (Prospere ) , around the world, is quite a rare surname. The cognomen Prospere is characteristic of Latin America and the Caribbean, particularly Saint Lucia, where it is a common surname, U.S. Virgin Islands, where it is quite a common surname, and Barbados, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Saint Lucia, the United States, and Cameroon. Likewise, Prospere is the forename as well as the last name.