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Surname Christiani (Christiani , 克里斯蒂 , כריסטיאני ) , around the world, is a common family name. The last name Christiani is habitual in Indonesia, where it is quite a rare surname, Trinidad and Tobago, and Germany, where it is a rare surname. Measured by absolute frequency, it is commonest in Indonesia, Germany, and the United States. Very seldom, Christiani is the forename as well as the last name.