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Cognomen Swail (سويل , 斯威爾 , Swail ) , throughout the world, is a rare last name. The family name Swail is characteristic of Libya, where it is quite a rare surname, Ireland, where it is a rare surname, and Canada. Not in comparison with a country's population, it is the most numerous in Libya, Canada, and South Africa. More prevalently, Swail is the forename as well as the last name.