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Cognomen Sustar (Sustar ) , all around the world, is quite a rare last name. The surname Sustar is characteristic of Southern Europe, particularly Slovenia, where it is quite a common surname, Serbia, where it is quite a rare surname, and Croatia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Slovenia, the United States, and Serbia. Much less frequently, Sustar is the forename as well as the last name.