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Family name Merman (Merman , Мерман , מרמן ) , all over the world, is a rare last name. The cognomen Merman is characteristic of Estonia, where it is quite a rare surname, Israel, where it is a rare surname, and Kazakhstan. Not in comparison with a country's population, the name is most common in the United States, Russia, and Kazakhstan. Also, Merman is the forename as well as the last name.