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Last name Simma (Simma , สิมมา , Симма ) , in the world, is a common cognomen. The cognomen Simma is characteristic of Austria, where it is quite a common surname, Thailand, where it is quite a rare surname, and Laos. Measured by absolute frequency, the name is most common in India, Thailand, and Austria. Also, Simma is the forename as well as the last name.