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Family name Yuasa (ユアサ , Yuasa , Юаса ) , around the world, is quite a rare surname. The cognomen Yuasa is habitual in Cayman Islands, where it is quite a rare surname, Japan, where it is a rare surname, and Portugal. Not in comparison with a country's population, it is the most numerous in Japan, Brazil, and Indonesia. More prevalently, Yuasa is the forename as well as the last name.