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Last name Blanch (Blanche , Blanc , Blanch ) , in all the world, is a widespread surname. The family name Blanch is characteristic of Dominica, where it is a common surname, France, and Algeria, where it is quite a common surname (explore the name in all countries). In absolute terms, the name is most common in France, Algeria, and Cameroon. Likewise, Blanch is the forename as well as the last name.