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Cognomen Pastan (Pastan , باستان , פסטן ) , around the world, is quite a rare surname. The surname Pastan is characteristic of Iran, where it is quite a rare surname, Afghanistan, where it is a rare surname, and Israel, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Iran, Afghanistan, and Thailand. Much less frequently, Pastan is the forename as well as the last name.