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Surname Massy (Massy , マッシー , 马西 ) , around the globe, is quite a common last name. The cognomen Massy is habitual in Monaco, where it is quite a common surname, Eswatini, where it is quite a rare surname, and Trinidad and Tobago. Not in comparison with a country's population, it most frequently occurs in France, India, and the Democratic Republic of the Congo. Also, Massy is the forename as well as the last name.