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Cognomen Duplus (Doble
, Dobel
, Dublu
) , throughout the world, is a common last name. The family name Duplus is characteristic of Latvia, where it is quite a rare surname, Philippines, and Australia. Measured by absolute frequency, this name is the most popular in Philippines, the United States, and the United Kingdom. Much less frequently, Duplus is the forename as well as the last name.