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Family name Triet (Triet , Triết , Triêt) , across the world, is quite a rare last name. The surname Triet is characteristic of Liechtenstein, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Vietnam, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Vietnam, Switzerland, and Netherlands. Also, Triet is the forename as well as the last name.