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Cognomen Sipan (Sipan , Сипан , سیپان) , across the world, is quite a rare last name. The cognomen Sipan is habitual in Peru, where it is quite a rare surname, Armenia, and Syria, where it is a rare surname. Measured by absolute frequency, it is commonest in Peru, Indonesia, and Iraq. Likewise, Sipan is the forename as well as the last name.