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Surname Масару (Masaru , 長 , 勝 ) , in all the world, is quite a common cognomen. The last name Масару is habitual in Israel, where it is quite a rare surname, China, where it is a rare surname, and Romania. Not in comparison with a country's population, the name is most common in China, India, and Israel. Also, Масару is the forename as well as the last name.