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Family name Ploy (พลอย , Ploy , Ployer ) , in all the world, is quite a rare surname. The cognomen Ploy is characteristic of Austria, where it is quite a rare surname, Laos, and Switzerland, where it is a rare surname. Measured by absolute frequency, the name is most common in Myanmar, France, and Thailand. More frequently, Ploy is the forename as well as the last name.