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Last name Faustin (Faustin , Фостен , פוסטן ) , around the world, is a common family name. The surname Faustin is habitual in Rwanda, where it is quite a common surname, Aruba, and Haiti. Measured by absolute frequency, this name is the most popular in Tanzania, Rwanda, and Haiti. More prevalently, Faustin is the forename as well as the last name.