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Last name 泰男 (Yasuo , 泰男 ) , all around the world, is quite a common cognomen. The surname 泰男 is habitual in Japan, where it is quite a rare surname, Israel, and Taiwan. Not in comparison with a country's population, it is the most numerous in Japan, China, and Egypt. Very seldom, 泰男 is the forename as well as the last name.