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Cognomen Masum (Masum , معصوم , মাসুম ) , across the world, is a widespread last name. The cognomen Masum is habitual in Bangladesh, where it is quite a common surname, Oman, and Qatar (explore the name in all countries). Measured by absolute frequency, it is commonest in Bangladesh, India, and Saudi Arabia. Likewise, Masum is the forename as well as the last name.