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Cognomen Salmu (Salmu , Салм ) , worldwide, is a rare family name. The last name Salmu is habitual in Estonia, where it is quite a rare surname, Finland, and Oman, where it is a rare surname. Not in comparison with a country's population, the name is most common in Finland, Tanzania, and the United States. More prevalently, Salmu is the forename as well as the last name.