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Cognomen 國松 (Kunimatsu , 國松 , Kunimatu) , throughout the world, is a very rare family name. The surname 國松 is characteristic of Brazil, where it is a very rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. In absolute terms, it is commonest in Brazil, China, and the United States. Much more frequently, 國松 is the forename as well as the last name.