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Cognomen Sowle (索尔 , Sowle ) , worldwide, is a rare surname. The last name Sowle is habitual in the United States, where it is a rare surname, the United Kingdom, where it is a very rare surname, and Canada. In absolute terms, it is commonest in the United States, India, and the United Kingdom. Much less frequently, Sowle is the forename as well as the last name.