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Last name Samm (Samm , サム , 샘 ) , throughout the world, is quite a rare surname. The surname Samm is characteristic of Estonia, where it is quite a rare surname, Trinidad and Tobago, and Saudi Arabia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Japan, the United States, and Saudi Arabia. Also, Samm is the forename as well as the last name.