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Surname やまだ (Yamada , やまだ) , around the world, is a common cognomen. The cognomen やまだ is habitual in Bermuda, where it is quite a common surname, Japan, where it is quite a rare surname, and Singapore. Not in comparison with a country's population, the name is most common in Brazil, Japan, and the United States. Very seldom, やまだ is the forename as well as the last name.