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Cognomen Kasamatsu (Kasamatsu
, 笠松
) , in all the world, is a rare surname. The last name Kasamatsu is characteristic of Paraguay, where it is quite a rare surname, Japan, where it is a very rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in Paraguay, Japan, and Brazil. Very seldom, Kasamatsu is the forename as well as the last name.