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Surname Arnstein (Arnstein , ארנשטיין ) , all around the world, is a rare family name. The family name Arnstein is characteristic of Czechia, where it is quite a rare surname, Israel, and Norway, where it is a rare surname. Measured by absolute frequency, this name is the most popular in the United States, Czechia, and Israel. Also, Arnstein is the forename as well as the last name.