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Cognomen Mcswain (Sveinn
, Mcswain
) , throughout the world, is quite a common last name. The surname Mcswain is characteristic of Iceland, where it is quite a rare surname, the United States, and Australia, where it is a rare surname. In absolute terms, the name is most common in the United States, Australia, and Canada. Very seldom, Mcswain is the forename as well as the last name.