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Cognomen Thomassin (Thomassin , Томассен ) , globally, is quite a rare surname. The surname Thomassin is characteristic of France, where it is quite a rare surname, Canada, and New Zealand, where it is a rare surname. Not in comparison with a country's population, the name is most common in France, Canada, and Germany. Very seldom, Thomassin is the forename as well as the last name.