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Last name Venn (维恩 , Veine , Venn ) , across the world, is quite a common cognomen. The surname Venn is characteristic of Australia, where it is quite a rare surname, the United Kingdom, and Sierra Leone. Not in comparison with a country's population, this name is the most popular in the United Kingdom, the United States, and Australia. Also, Venn is the forename as well as the last name.